drm/amdkfd: Add xcp reference to kfd node

Fetch xcp information from xcp_mgr and also add xcc_mask to kfd node.

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>