sunxi: Add support for Cubieboard4

The Cubieboard4 is an A80 SoC based development board from Cubietech.

This board has a UART port, 4 USB host ports, a USB 3.0 OTG connector,
HDMI and VGA outputs, a micro SD slot, 8G eMMC flash, 2G DRAM, a WiFi/BT
combo chip, headphone and microphone jacks, IR receiver, and GPIO headers.

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 88abf2d..d7dc55b 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -122,6 +122,11 @@
 F:	configs/Cubieboard2_defconfig
 F:	configs/Cubietruck_defconfig
 
+CUBIEBOARD4 BOARD
+M:	Chen-Yu Tsai <wens@csie.org>
+S:	Maintained
+F:	configs/Cubieboard4_defconfig
+
 CUBIETRUCK-PLUS BOARD
 M:	Chen-Yu Tsai <wens@csie.org>
 S:	Maintained