sun6i: Add new board Merrii Hummingbird A31

The Merrii Hummingbird A31 is a A31 based development board with 1G
RAM, 8G NAND, AP6210 WiFi+BT, gigabit ethernet, USB OTG, 2 USB 2.0
ports connected to a USB hub chip, HDMI, VGA, TV and stereo in/out.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/board/sunxi/MAINTAINERS b/board/sunxi/MAINTAINERS
index 013d485..1a1814c 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -55,6 +55,11 @@
 S:	Maintained
 F:	configs/Colombus_defconfig
 
+HUMMINIGBIRD-A31 BOARD
+M:	Chen-Yu Tsai <wens@csie.org>
+S:	Maintained
+F:	configs/Hummingbird_A31_defconfig
+
 IPPO-Q8H-V5 BOARD
 M:	Chen-Yu Tsai <wens@csie.org>
 S:	Maintained