sunxi: Add support for OrangePi Zero2

OrangePi Zero2 is SBC based on Allwinner H616 with 1 GiB of RAM, SD card
support, gigabit ethernet, micro HDMI, WIFI, Bluetooth and 1 USB 2.0
port. It also has two GPIO headers which allows further peripherals to
be used.

The devicetree file is taken from v3 of the OrangePi Zero2 Linux
submission [1], which it's not yet merged.

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2021-January/632084.html

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/board/sunxi/MAINTAINERS b/board/sunxi/MAINTAINERS
index 46db701..76eba2a 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -425,6 +425,11 @@
 S:	Maintained
 F:	configs/orangepi_zero_plus2_h3_defconfig
 
+ORANGEPI ZERO 2 BOARD
+M:	Jernej Skrabec <jernej.skrabec@siol.net>
+S:	Maintained
+F:	configs/orangepi_zero2_defconfig
+
 ORANGEPI PC 2 BOARD
 M:	Andre Przywara <andre.przywara@arm.com>
 S:	Maintained