Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20170927' into staging

Another s390x compat fix that should make it into 2.10.1.

# gpg: Signature made Wed 27 Sep 2017 10:30:16 BST
# gpg:                using RSA key 0xDECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>"
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>"
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20170927:
  s390x/cpumodel: remove ais from z14 default model-> also for 2.10.1

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>