drm/amdgpu: enable VCN PG and CG for yellow carp

Enable VCN 3.0 PG and CG for Yellow Carp by setting up flags.

Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: James Zhu <James.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>