sun50i: a64: Add initial NanoPi A64 support

NanoPi A64 is a new board of high performance with low cost
designed by FriendlyElec., using the Allwinner A64 SOC.

Nanopi A64 features
- Allwinner A64, 64-bit Quad-core Cortex-A53@648MHz to 1.152GHz, DVFS
- 1GB DDR3 RAM
- MicroSD
- Gigabit Ethernet (RTL8211E)
- Wi-Fi 802.11b/g/n
- IR receiver
- Audio In/Out
- Video In/Out
- Serial Debug Port
- microUSB 5V 2A DC power-supply

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/configs/nanopi_a64_defconfig b/configs/nanopi_a64_defconfig
new file mode 100644
index 0000000..2f4ed11
--- /dev/null
+++ b/configs/nanopi_a64_defconfig
@@ -0,0 +1,15 @@
+CONFIG_ARM=y
+CONFIG_ARCH_SUNXI=y
+CONFIG_MACH_SUN50I=y
+CONFIG_RESERVE_ALLWINNER_BOOT0_HEADER=y
+CONFIG_DEFAULT_DEVICE_TREE="sun50i-a64-nanopi-a64"
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SPL=y
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_FPGA is not set
+# CONFIG_SPL_DOS_PARTITION is not set
+# CONFIG_SPL_ISO_PARTITION is not set
+# CONFIG_SPL_EFI_PARTITION is not set
+CONFIG_SUN8I_EMAC=y
+CONFIG_USB_EHCI_HCD=y