xfs: devirtualize ->data_get_ftype and ->data_put_ftype

xfs: devirtualize ->data_get_ftype and ->data_put_ftype

Source kernel commit: 59b8b465058ec203493c0436f243263051e08f5a

Replace the ->data_get_ftype and ->data_put_ftype dir ops methods with
directly called xfs_dir2_data_get_ftype and xfs_dir2_data_put_ftype
helpers that takes care of the differences between the directory format
with and without the file type field.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>