Merge remote-tracking branch 'remotes/philmd/tags/mips-20210413' into staging

MIPS patches queue

- Fix invalid Kconfig dependency
- Fix missing migrated value
- Fix TCG temporary leak

# gpg: Signature made Tue 13 Apr 2021 11:10:11 BST
# 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/tags/mips-20210413:
  target/mips: Fix TCG temporary leak in gen_cache_operation()
  hw/isa/piix4: Migrate Reset Control Register
  hw/isa/Kconfig: Add missing dependency VIA VT82C686 -> APM

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