sunxi: add Cubieboard2 support

This is a sun7i (A20) based followup to the sun4i (A10)
Cubieboard. It has GMAC using MII mode.

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/board/sunxi/Makefile b/board/sunxi/Makefile
index 7083632..62acb8f 100644
--- a/board/sunxi/Makefile
+++ b/board/sunxi/Makefile
@@ -12,5 +12,6 @@
 obj-$(CONFIG_SUNXI_GMAC)	+= gmac.o
 obj-$(CONFIG_A13_OLINUXINOM)	+= dram_a13_oli_micro.o
 obj-$(CONFIG_CUBIEBOARD)	+= dram_cubieboard.o
+obj-$(CONFIG_CUBIEBOARD2)	+= dram_cubieboard2.o
 obj-$(CONFIG_CUBIETRUCK)	+= dram_cubietruck.o
 obj-$(CONFIG_R7DONGLE)		+= dram_r7dongle.o