Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-2.9-20170323' into staging

ppc patch queue for 2017-03-23

Just a single bugfix in this batch.  It's not strictly in ppc code,
though it's for the pseries machine's benefit.  Eduardo suggested it
go through my tree however.

# gpg: Signature made Thu 23 Mar 2017 10:09:17 GMT
# gpg:                using RSA key 0x6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>"
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>"
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>"
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>"
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-2.9-20170323:
  numa,spapr: align default numa node memory size to 256MB

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