I²C / SMBus / PMBus patches

- Add some Renesas models
- Add Titus Rwantare to MAINTAINERS

# gpg: Signature made Tue 08 Mar 2022 18:11:46 GMT
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD  6BB2 E3E3 2C2C DEAD C0DE

* remotes/philmd/tags/pmbus-20220308:
  hw/sensor: add Renesas raa228000 device
  hw/sensor: add Renesas raa229004 PMBus device
  hw/sensor: add Intersil ISL69260 device model
  hw/i2c: Added linear mode translation for pmbus devices
  hw/i2c: pmbus: update MAINTAINERS
  hw/i2c: pmbus: refactor uint handling
  hw/i2c: pmbus: add PEC unsupported warning
  hw/i2c: pmbus: fix error returns and guard against out of range accesses
  hw/i2c: pmbus: add registers

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