board: atmel: add SAMA5D2 PTC Engineering board

The board supports following features:
 - Boot media support: NAND Flash/SPI Flash
 - Support ethernet
 - Support USB mass storage

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
diff --git a/configs/sama5d2_ptc_nandflash_defconfig b/configs/sama5d2_ptc_nandflash_defconfig
new file mode 100644
index 0000000..7425184
--- /dev/null
+++ b/configs/sama5d2_ptc_nandflash_defconfig
@@ -0,0 +1,12 @@
+CONFIG_ARM=y
+CONFIG_ARCH_AT91=y
+CONFIG_TARGET_SAMA5D2_PTC=y
+CONFIG_SPL=y
+CONFIG_SYS_EXTRA_OPTIONS="SAMA5D2,SYS_USE_NANDFLASH"
+# CONFIG_CMD_IMI is not set
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_LOADS is not set
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_SF=y
+# CONFIG_CMD_FPGA is not set
+CONFIG_SPI_FLASH=y