sunxi: Add usb keyboard Kconfig option

For use together with the hdmi console.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
diff --git a/configs/Colombus_defconfig b/configs/Colombus_defconfig
index bef568d..de78a01 100644
--- a/configs/Colombus_defconfig
+++ b/configs/Colombus_defconfig
@@ -1,5 +1,6 @@
 CONFIG_SPL=y
 CONFIG_FDTFILE="sun6i-a31-colombus.dtb"
+CONFIG_USB_KEYBOARD=n
 +S:CONFIG_ARM=y
 +S:CONFIG_ARCH_SUNXI=y
 +S:CONFIG_MACH_SUN6I=y