Pavel Machek complained that the question about supporting deprecated
XFS v4 comes up even when XFS is disabled. This clearly makes no sense,
so fix Kconfig.
Reported-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Eric Sandeen <sandeen@redhat.com>