Merge remote-tracking branch 'remotes/philmd-gitlab/tags/mips-fixes-20201109' into...

MIPS patches queue

- Deprecate nanoMIPS ISA
- Fix PageMask with variable page size (Huacai Chen)
- Fix memory leak in boston_fdt_filter (Coverity CID 1432275, Peter Maydell)

CI jobs results:
. https://cirrus-ci.com/build/5439131968864256
. https://gitlab.com/philmd/qemu/-/pipelines/213403385
. https://travis-ci.org/github/philmd/qemu/builds/742312387

# gpg: Signature made Sun 08 Nov 2020 23:41:19 GMT
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD  6BB2 E3E3 2C2C DEAD C0DE

* remotes/philmd-gitlab/tags/mips-fixes-20201109:
  hw/mips/boston: Fix memory leak in boston_fdt_filter() error-handling paths
  target/mips: Fix PageMask with variable page size
  target/mips: Deprecate nanoMIPS ISA

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