sunxi: add proper device tree for Orange Pi Zero boards

Add a proper device tree file for Orange Pi Zero boards from Xunlong,
which come with a Allwinner H2+ SoC (similar to H3).

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 3ee608b..66ea0b3 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -271,6 +271,7 @@
 	sun8i-a83t-cubietruck-plus.dtb \
 	sun8i-a83t-sinovoip-bpi-m3.dtb
 dtb-$(CONFIG_MACH_SUN8I_H3) += \
+	sun8i-h2-plus-orangepi-zero.dtb \
 	sun8i-h3-bananapi-m2-plus.dtb \
 	sun8i-h3-orangepi-2.dtb \
 	sun8i-h3-orangepi-lite.dtb \