drm/amd/display: Disable OPTC pg to match DC Hubp/dpp pg

[Why]
To match the hardware sequence

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Allen <allen.pan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>