Merge remote-tracking branch 'remotes/dg-gitlab/tags/ppc-for-5.2-20201105' into staging

ppc patch queue for 2020-11-05

A small PR this time, one bugfix, one removal of minor dead code, one
warning suppression.

# gpg: Signature made Thu 05 Nov 2020 03:44:51 GMT
# gpg:                using RSA key 75F46586AE61A66CC44E87DC6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>" [full]
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>" [full]
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>" [full]
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>" [unknown]
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dg-gitlab/tags/ppc-for-5.2-20201105:
  spapr: Convert hpt_prepare_thread() to use qemu_try_memalign()
  spapr: Drop dead code in spapr_reallocate_hpt()
  target/ppc/excp_helper: Add a fallthrough for fix compiler warning

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