drm/amd/display: add gamut coefficient set A and B

[Why]
Screen shake on DCN3 night light SDR BR3.

[How]
Change the logic to use double buffer reisgter on gamut settings.

Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Jingwen Zhu <jingwen.zhu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>