Merge tag 'for-v2020.07' of https://gitlab.denx.de/u-boot/custodians/u-boot-i2c

i2c changes for 2020.07
- add new i2c driver for Broadcom iproc-based socs
- fix cmd: eeprom: Staticize eeprom_i2c_bus
- i2c: muxes: pca954x: add PCA9546 variant