drm/radeon: remove obsolete kfd_bo from radeon_device

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/gpu/drm/radeon/radeon.h

@@ -2458,7 +2458,6 @@ struct radeon_device {
 
 	/* amdkfd interface */
 	struct kfd_dev		*kfd;
-	struct radeon_sa_manager	kfd_bo;
 
 	struct mutex	mn_lock;
 	DECLARE_HASHTABLE(mn_hash, 7);