drm/amdgpu: Add callback to fill xcp memory id

Add callback in xcp interface to fill xcp memory id information. Memory
id is used to identify the range/partition of an XCP from the available
memory partitions in device. Also, fill the id information.

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>