xfs: sync up xfs_trans_inode with userspace

Add an XFS_ICHGTIME_CREATE case to xfs_trans_ichgtime() to keep in
sync with userspace.  (Currently no kernel caller sends this flag.)

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