btrfs: add a btrfs_dio_rw wrapper

Add a wrapper around iomap_dio_rw that keeps the direct I/O internals
isolated in inode.c.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>