s390/kconfig: disable CONFIG_VIRTIO_MMIO

This bug was fixed in the package linux - 4.4.0-15.31

---------------
linux (4.4.0-15.31) xenial; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1559252

  * Xilinx KU3 Capi card does not show up in Ubuntu 16.04 (LP: #1557001)
    - SAUCE: (noup) cxl: Allow initialization on timebase sync failures

  * policy namespace stacking (LP: #1379535)
    - Revert "UBUNTU: SAUCE: Move replacedby allocation into label_alloc"
    - Revert "UBUNTU: SAUCE: Fixup: __label_update() still doesn't handle some cases correctly."
    - Revert "UBUNTU: SAUCE: fix: audit "no_new_privs" case for exec failure"
    - Revert "UBUNTU: SAUCE: fixup: warning about aa_label_vec_find_or_create not being static"
    - Revert "UBUNTU: SAUCE: apparmor: fix refcount race when finding a child profile"
    - Revert "UBUNTU: SAUCE: fixup: cast poison values to remove warnings"
    - Revert "UBUNTU: SAUCE: fixup: get rid of unused var build warning"
    - Revert "UBUNTU: SAUCE: fixup: 20/23 locking issue around in __label_update"
    - Revert "UBUNTU: SAUCE: fixup: make __share_replacedby private to get rid of build warning"
    - Revert "UBUNTU: SAUCE: fix: replacedby forwarding is not being properly update when ns is destroyed"
    - Revert "UBUNTU: SAUCE: apparmor: fix log of apparmor audit message when kern_path() fails"
    - Revert "UBUNTU: SAUCE: fixup: cleanup return handling of labels"
    - Revert "UBUNTU: SAUCE: apparmor: fix: ref count leak when profile sha1 hash is read"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: query label file permission"
    - Revert "UBUNTU: SAUCE: apparmor: Don't remove label on rcu callback if the label has already been removed"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: break circular refcount for label that is directly freed."
    - Revert "UBUNTU: SAUCE: apparmor: Fix: refcount bug when inserting label update that transitions ns"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: now that insert can force replacement use it instead of remove_and_insert"
    - Revert "UBUNTU: SAUCE: apparmor Fix: refcount bug in pivotroot mediation"
    - Revert "UBUNTU: SAUCE: apparmor: ensure that repacedby sharing is done correctly"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: update replacedby allocation to take a gfp parameter"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: convert replacedby update to be protected by the labelset lock"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: add required locking of __aa_update_replacedby on merge path"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: deadlock in aa_put_label() call chain"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: label_vec_merge insertion"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: ensure new labels resulting from merge have a replacedby"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: refcount leak in aa_label_merge"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: refcount race between locating in labelset and get"
    - Revert "UBUNTU: SAUCE: apparmor: Fix: label merge handling of marking unconfined and stale"
    - Revert "UBUNTU: SAUCE: apparmor: add underscores to indicate aa_label_next_not_in_set() use needs locking"
    - Revert "UBUNTU: SAUCE: apparmor: debug: POISON label and replaceby ...

------- Comment From <email address hidden> 2016-03-23 11:54 EDT-------
Verified on kernel 4.4.0-15

root@s83lp41:~# cat /boot/config-4.4.0-15-generic | grep VIRTIO_MM
# CONFIG_VIRTIO_MMIO is not set

root@s83lp41:~# uname -a
Linux s83lp41 4.4.0-15-generic #31-Ubuntu SMP Fri Mar 18 19:07:12 UTC 2016 s390x s390x s390x GNU/Linux