drm/amd/display: Fix up missing 'dc' & 'pipe_ctx' kdoc parameters in delay_cursor_unt...

drm/amd/display: Fix up missing 'dc' & 'pipe_ctx' kdoc parameters in delay_cursor_until_vupdate()

Fixes the following gcc with W=1:

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:1904: warning: Function parameter or member 'dc' not described in 'delay_cursor_until_vupdate'
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:1904: warning: Function parameter or member 'pipe_ctx' not described in 'delay_cursor_until_vupdate'

Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>