Merge tag 'u-boot-atmel-2021.07-b' of https://source.denx.de/u-boot/custodians/u-boot-atmel

Second set of u-boot-atmel features for 2021.07 cycle:

This small feature set include support for 5th PIO bank on pio4 pinctrl
driver and a fix for the SPL on sama5d3.