Merge remote-tracking branch 'remotes/dg-gitlab/tags/ppc-for-5.2-20201124' into staging

Merge remote-tracking branch 'remotes/dg-gitlab/tags/ppc-for-5.2-20201124' into staging

ppc patch queue for 2020-11-24

One final update for qemu-5.2, implementing an instruction that we
already should have, given the ISA version we claim to support.  Sorry
for the lateness, I've been on holiday.

This isn't a regression, obviously, so if it misses qemu-5.2 it's not
a disaster, but it would be nice to have.  The risk is low that it
would break any existing instructions.

# gpg: Signature made Tue 24 Nov 2020 05:50:29 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-5.2-20201124:
  ppc/translate: Implement lxvwsx opcode

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