RDMA/uverbs: Replace ib_uverbs_file with uverbs_attr_bundle for write

Now that we can add meta-data to the description of write() methods we
need to pass the uverbs_attr_bundle into all write based handlers so
future patches can use it as a container for any new data transferred out
of the core.

This is the first step to bringing the write() and ioctl() methods to a
common interface signature.

This is a simple search/replace, and we push the attr down into the uobj
and other APIs to keep changes minimal.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

drivers/infiniband/hw/mlx5/devx.c

@@ -42,7 +42,7 @@ struct devx_umem_reg_cmd {
 
 static struct mlx5_ib_ucontext *devx_ufile2uctx(struct ib_uverbs_file *file)
 {
-	return to_mucontext(ib_uverbs_get_ucontext(file));
+	return to_mucontext(ib_uverbs_get_ucontext_file(file));
 }
 
 int mlx5_ib_devx_create(struct mlx5_ib_dev *dev)