xfs_db: identify attr dabtree field types correctly

xfs_db: identify attr dabtree field types correctly

For whatever reason, the v5 xattr dabtree header fields are mapped to
the directory dabtree header fields, which means that the types are
wrong and hence we cannot use the 'addr' command to step through the
tree.  Since the v4 attr dabtree does this correctly, simply port the v5
fields to the attr code too.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>