drm/amd/display/dc/bios/bios_parser: Fix a whole bunch of legacy doc formatting

drm/amd/display/dc/bios/bios_parser: Fix a whole bunch of legacy doc formatting

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:2588:16: warning: no previous prototype for ‘update_slot_layout_info’ [-Wmissing-prototypes]
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:2692:16: warning: no previous prototype for ‘get_bracket_layout_record’ [-Wmissing-prototypes]
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:925: warning: Function parameter or member 'dcb' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:925: warning: Function parameter or member 'signal' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:925: warning: Function parameter or member 'index' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:925: warning: Function parameter or member 'ss_info' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:997: warning: Function parameter or member 'bp' not described in 'get_ss_info_from_tbl'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:997: warning: Function parameter or member 'id' not described in 'get_ss_info_from_tbl'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:997: warning: Function parameter or member 'ss_info' not described in 'get_ss_info_from_tbl'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1022: warning: Function parameter or member 'bp' not described in 'get_ss_info_from_internal_ss_info_tbl_V2_1'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1022: warning: Function parameter or member 'id' not described in 'get_ss_info_from_internal_ss_info_tbl_V2_1'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1022: warning: Function parameter or member 'info' not described in 'get_ss_info_from_internal_ss_info_tbl_V2_1'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1087: warning: Function parameter or member 'bp' not described in 'get_ss_info_from_ss_info_table'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1087: warning: Function parameter or member 'id' not described in 'get_ss_info_from_ss_info_table'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1087: warning: Function parameter or member 'ss_info' not described in 'get_ss_info_from_ss_info_table'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1469: warning: Function parameter or member 'dcb' not described in 'bios_parser_get_encoder_cap_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1469: warning: Function parameter or member 'object_id' not described in 'bios_parser_get_encoder_cap_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1469: warning: Function parameter or member 'info' not described in 'bios_parser_get_encoder_cap_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1508: warning: Function parameter or member 'bp' not described in 'get_encoder_cap_record'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1508: warning: Function parameter or member 'object' not described in 'get_encoder_cap_record'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1566: warning: Function parameter or member 'dcb' not described in 'bios_parser_get_ss_entry_number'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1566: warning: Function parameter or member 'signal' not described in 'bios_parser_get_ss_entry_number'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1619: warning: Function parameter or member 'bp' not described in 'get_ss_entry_number_from_ss_info_tbl'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1619: warning: Function parameter or member 'id' not described in 'get_ss_entry_number_from_ss_info_tbl'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1686: warning: Function parameter or member 'bp' not described in 'get_ss_entry_number'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1686: warning: Function parameter or member 'id' not described in 'get_ss_entry_number'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1705: warning: Function parameter or member 'bp' not described in 'get_ss_entry_number_from_internal_ss_info_tbl_v2_1'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1705: warning: Function parameter or member 'id' not described in 'get_ss_entry_number_from_internal_ss_info_tbl_v2_1'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1740: warning: Function parameter or member 'bp' not described in 'get_ss_entry_number_from_internal_ss_info_tbl_V3_1'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1740: warning: Function parameter or member 'id' not described in 'get_ss_entry_number_from_internal_ss_info_tbl_V3_1'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1783: warning: Function parameter or member 'dcb' not described in 'bios_parser_get_gpio_pin_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1783: warning: Function parameter or member 'gpio_id' not described in 'bios_parser_get_gpio_pin_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:1783: warning: Function parameter or member 'info' not described in 'bios_parser_get_gpio_pin_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:2211: warning: Function parameter or member 'dcb' not described in 'bios_parser_set_scratch_critical_state'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:2211: warning: Function parameter or member 'state' not described in 'bios_parser_set_scratch_critical_state'

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>