ARM: sun6i: Add Colombus board defconfig

The Colombus board is an A31 evaluation board from WITS Technology.

Maxime has kindly agreed to maintain this board.

[1] http://lists.denx.de/pipermail/u-boot/2014-September/190043.html

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

board/sunxi/MAINTAINERS

@@ -45,3 +45,8 @@ M:	Iain Paton <ipaton0@gmail.com>
 S:	Maintained
 F:	board/sunxi/dram_a20_olinuxino_l2.c
 F:	configs/A20-OLinuXino-Lime2_defconfig
+
+COLOMBUS BOARD
+M:	Maxime Ripard <maxime.ripard@free-electrons.com>
+S:	Maintained
+F:	configs/Colombus_defconfig

configs/Colombus_defconfig

@@ -0,0 +1,4 @@
+CONFIG_SYS_EXTRA_OPTIONS="COLOMBUS"
+CONFIG_ARM=y
+CONFIG_TARGET_SUN6I=y
+CONFIG_FDTFILE="sun6i-a31-colombus.dtb"