Merge tag 'i2c-updates-for-2025-10-rc2' of https://source.denx.de/u-boot/custodians...

i2c updates for v2025.10-rc2

bugfixes:

- rcar_iic: do not use unitialised variable
  from Andrew

- fix coverity issue in cmd/i2c.c
  from Heiko

new driver:

late, but hopefully okay for rc2, as already picked up when
merge window was open, but there was a problem in common code,
which is now fixed

- new i3c driver support from Dinesh