sunxi: Add Marsboard A10 support

This patch add support for Marsboard A10 board.

The Marsboard A10 is a A10 based development board with 1G RAM, 1G NAND,
micro SD card slot, SATA 2.0 socket, 10/100 ethernet, mini HDMI port,
1 USB OTG port and 2 USB 2.0 ports. Board does not use the AXP209 pmic,
it does not have a pmic at all.
Board also have 2 expansion 70 pin headers.

Signed-off-by: Aleksei Mamlin <mamlinav@gmail.com>
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 9a83537..f0c729b 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -83,3 +83,8 @@
 M:	Zoltan Herpai <wigyori@uid0.hu>
 S:	Maintained
 F:	configs/Linksprite_pcDuino_defconfig
+
+MARSBOARD-A10 BOARD
+M:	Aleksei Mamlin <mamlinav@gmail.com>
+S:	Maintained
+F:	configs/Marsboard_A10_defconfig