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/Kconfig b/board/sunxi/Kconfig
index f7da704..88f09fb 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -111,6 +111,10 @@
 	bool "CUBIETRUCK"
 	depends on MACH_SUN7I
 
+config TARGET_HUMMINGBIRD_A31
+	bool "HUMMINGBIRD_A31"
+	depends on MACH_SUN6I
+
 config TARGET_IPPO_Q8H_V5
 	bool "IPPO_Q8H_V5"
 	depends on MACH_SUN8I
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