drm/amdgpu: fix unexpected block id

Aldebaran supports VCN and JPEG RAS, it reports unexpected
block id message during VCN and JPEG RAS initialization if VCN
and JPEG block id not defined.

Signed-off-by: Stanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>