sunxi: Add defconfig and dts for Orange Pi 2 SBC

The Orange Pi 2 is a SBC based on the Allwinner H3 SoC with a uSD slot,
4 USB ports connected via a USB-2 hub, a 10/100M ethernet port using the
SoC's integrated PHY, Wifi via a RTL8189ETV sdio wifi chip, USB OTG, HDMI,
a TRRS headphone jack for stereo out and composite out, a microphone,
an IR receiver, a CSI connector, 2 LEDs, a 3 pin UART header
and a 40-pin GPIO header.

The added dts file is identical to the one submitted to the upstream
kernel.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 6112f52..ae75c76 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -201,6 +201,7 @@
 	sun8i-a83t-cubietruck-plus.dtb \
 	sun8i-a83t-sinovoip-bpi-m3.dtb
 dtb-$(CONFIG_MACH_SUN8I_H3) += \
+	sun8i-h3-orangepi-2.dtb \
 	sun8i-h3-orangepi-pc.dtb \
 	sun8i-h3-orangepi-plus.dtb
 dtb-$(CONFIG_MACH_SUN9I) += \