ARM: atmel: add sama5d3xek support

Add sama5d3xek support with following feature
  - boot from NAND flash, PMECC support, 4bit ECC @ 512 bytes sector
  - boot from SPI flash support
  - boot from SD card support
  - LCD support
  - EMAC support
  - USB OHCI support

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/boards.cfg b/boards.cfg
index ef1817f..c99bab8 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -249,6 +249,9 @@
 am335x_evm_usbspl            arm         armv7       am335x              ti             am33xx      am335x_evm:SERIAL1,CONS_INDEX=1,SPL_USBETH_SUPPORT
 ti814x_evm                   arm         armv7       ti814x              ti             am33xx
 pcm051                       arm         armv7       pcm051              phytec         am33xx      pcm051
+sama5d3xek_mmc               arm         armv7       sama5d3xek          atmel          at91        sama5d3xek:SAMA5D3,SYS_USE_MMC
+sama5d3xek_nandflash         arm         armv7       sama5d3xek          atmel          at91        sama5d3xek:SAMA5D3,SYS_USE_NANDFLASH
+sama5d3xek_spiflash          arm         armv7       sama5d3xek          atmel          at91        sama5d3xek:SAMA5D3,SYS_USE_SERIALFLASH
 highbank                     arm         armv7       highbank            -              highbank
 m53evk                       arm         armv7       m53evk              denx		mx5		m53evk:IMX_CONFIG=board/denx/m53evk/imximage.cfg
 mx51_efikamx                 arm         armv7       mx51_efikamx        genesi         mx5		mx51_efikamx:MACH_TYPE=MACH_TYPE_MX51_EFIKAMX,IMX_CONFIG=board/genesi/mx51_efikamx/imximage_mx.cfg