Move the code that adds the incore xfs_attr_item deferred work data to a
transaction live with the ATTRI log item code.  This means that the
upper level extended attribute code no longer has to know about the
inner workings of the ATTRI log items.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>