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drm/amd/display: Implement backlight_ops.get_brightness
[Why]
This hook that is supposed to read the actual backlight value
is used in a few places throughout the kernel to setup or force
update on backlight
[How]
Create a dc function that calls the existing abm function, and
call that function from amdgpu
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>