drm/amdgpu: Store additional numa node information

Use a struct to store additional numa node information including size
and base address. Add numa_info pointer to xcc object to point to the
relevant structure based on its proximity domain.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Le Ma <le.ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>