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>
diff --git a/configs/Colombus_defconfig b/configs/Colombus_defconfig
new file mode 100644
index 0000000..16800de
--- /dev/null
+++ b/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"