Merge tag 'u-boot-atmel-2020.01-b' of https://gitlab.denx.de/u-boot/custodians/u-boot-atmel

Second set of u-boot-atmel features and fixes for 2020.01 cycle

This feature set includes Eugen's work on a new tiny flexcom driver and
eeprom mac retrieval for the sam9x60-ek board.