sunxi: Fix gmac not working on the Colombus board

The phy is using a RGMII interface, which we need to specify in our
board-config, and the dts needs a gmac section (the dts changes have
also been submitted to the kernel).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/configs/Colombus_defconfig b/configs/Colombus_defconfig
index 1ae8c16..7fa9ef1 100644
--- a/configs/Colombus_defconfig
+++ b/configs/Colombus_defconfig
@@ -7,7 +7,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="sun6i-a31-colombus"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="SUNXI_GMAC"
+CONFIG_SYS_EXTRA_OPTIONS="SUNXI_GMAC,RGMII"
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_FPGA is not set