IB/uverbs: Delete type and id from uverbs_obj_attr

In this context the uobject is not allowed to be NULL, so type is the same
as uobject->type, and at least for IDR, id is the same as uobject->id.

FD objects should never handle the FD number outside the uAPI boundary
code.

Suggested-by: Guy Levi <guyle@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

include/rdma/uverbs_ioctl.h

@@ -344,11 +344,7 @@ struct uverbs_ptr_attr {
 };
 
 struct uverbs_obj_attr {
-	/* pointer to the kernel descriptor -> type, access, etc */
-	const struct uverbs_obj_type	*type;
 	struct ib_uobject		*uobject;
-	/* fd or id in idr of this object */
-	int				id;
 };
 
 struct uverbs_attr {