The sama5d4ek support boot up from NAND flash, SD/MMC card and
also the SPI flash.
Signed-off-by: NBo Shen <voice.shen@atmel.com>

The code for this board supports following features:
  - Boot media support: NAND flash/SD card/SPI flash
  - Support LCD display
  - Support ethernet
  - Support USB mass storage
Signed-off-by: NBo Shen <voice.shen@atmel.com>
Signed-off-by: NAndreas Bießmann <andreas.devel@googlemail.com>