drm/amdgpu: enable VCN3.0 PG and CG for navy_flounder

Enable VCN3.0 PG and CG for navy_flounder by setting up the flags to the ASIC

Signed-off-by: Boyuan Zhang <boyuan.zhang@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>