btrfs: make btrfs_add_ordered_extent_dio take btrfs_inode

Simply forwards its argument so let's get rid of one extra BTRFS_I by
taking btrfs_inode directly.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>