drm/amd/display/dc/core/dc: Convert function headers to kernel-doc

drm/amd/display/dc/core/dc: Convert function headers to kernel-doc

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

 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:3324: warning: Cannot understand  *****************************************************************************
 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:3344: warning: Cannot understand  *****************************************************************************
 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:3417: warning: Cannot understand  *****************************************************************************

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: 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>