drm/amdgpu: Add ualink handle to BOs

Add a ualink handle to the amdgpu_bo struct. The ualink
handle is a 128-bit unique identifier associated with a
BO and is shared across the network to facilitate NPA based
memory sharing across GPUs in a rack scale setup.
We are only storing the low 64 bits of that handle in the BO
struct as that is gauranteed to be unique.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_object.h

@@ -125,6 +125,9 @@ struct amdgpu_bo {
 	 * for memory accounting.
 	 */
 	int8_t				xcp_id;
+
+	/* UALink Handle low 64 bits*/
+	u64				ualink_handle_lo;
 };
 
 struct amdgpu_bo_user {