Revert "arm: Remove nsa310s board"

While this platform has not yet been converted, there is active efforts
to do so.  Keep the platform for now.

This reverts commit aa697e6904ba1b3144a46ec642d4695e7c0cdc3e.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/nsa310s_defconfig b/configs/nsa310s_defconfig
new file mode 100644
index 0000000..e4cf1c4
--- /dev/null
+++ b/configs/nsa310s_defconfig
@@ -0,0 +1,46 @@
+CONFIG_ARM=y
+CONFIG_SYS_DCACHE_OFF=y
+CONFIG_ARCH_CPU_INIT=y
+CONFIG_ARCH_KIRKWOOD=y
+CONFIG_SYS_TEXT_BASE=0x600000
+CONFIG_NR_DRAM_BANKS=2
+CONFIG_TARGET_NSA310S=y
+CONFIG_ENV_SIZE=0x20000
+CONFIG_ENV_OFFSET=0xE0000
+CONFIG_BOOTDELAY=3
+CONFIG_USE_PREBOOT=y
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_HUSH_PARSER=y
+CONFIG_SYS_PROMPT="nsa310s => "
+CONFIG_CMD_BOOTZ=y
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_IDE=y
+CONFIG_CMD_NAND=y
+CONFIG_CMD_USB=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_EXT2=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_JFFS2=y
+CONFIG_CMD_MTDPARTS=y
+CONFIG_MTDPARTS_DEFAULT="mtdparts=orion_nand:0xe0000@0x0(uboot),0x20000@0xe0000(uboot_env),0x100000@0x100000(second_stage_uboot),-@0x200000(root)"
+CONFIG_CMD_UBI=y
+CONFIG_ISO_PARTITION=y
+CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_IN_NAND=y
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+CONFIG_NETCONSOLE=y
+# CONFIG_MMC is not set
+CONFIG_MTD=y
+CONFIG_MTD_RAW_NAND=y
+CONFIG_MVGBE=y
+CONFIG_MII=y
+CONFIG_SYS_NS16550=y
+CONFIG_USB=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_STORAGE=y
+CONFIG_LZMA=y
+CONFIG_BZIP2=y
+CONFIG_OF_LIBFDT=y