Second set of u-boot-atmel features for 2021.04 cycle This feature set includes macb updates for all interfaces and new sama7g5 variant support; micrel ksz9031 DLL support; a new board from Giant based on Adafruit feather form factor which contains a SAMA5D27 SoC; several fixes regarding the NAND flash PMECC block; and pincontrol drive strength support for pio4 controller.