Merge tag 'for-v2021.10-rc3' of https://source.denx.de/u-boot/custodians/u-boot-i2c

i2c changes for for-v2021.10-rc3

new driver:
- Introduce mcp230xx support
  from Sebastian Reichel

new feature:
- i2c-gpio: add support for "sda-gpios" + "scl-gpios" i2c-gpio bindings.
  from Samuel Holland

- bootcount: add a new driver with syscon as backend
  from Nandor Han