ARM: atmel: add sama5d4 xplained ultra board support

The code for this board supports following features:
  - Boot media support: NAND flash/SD card/SPI flash
  - Support LCD display (optional, disabled by default)
  - Support ethernet
  - Support USB mass storage

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/configs/sama5d4_xplained_nandflash_defconfig b/configs/sama5d4_xplained_nandflash_defconfig
new file mode 100644
index 0000000..5e13da7
--- /dev/null
+++ b/configs/sama5d4_xplained_nandflash_defconfig
@@ -0,0 +1,3 @@
+CONFIG_SYS_EXTRA_OPTIONS="SAMA5D4,SYS_USE_NANDFLASH"
++S:CONFIG_ARM=y
++S:CONFIG_TARGET_SAMA5D4_XPLAINED=y