drm/amdgpu: enable Arcturus CG for VCN and JPEG blocks

Arcturus VCN and JPEG only got CG support, and no PG support

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