ARM: dts: sun4i: Enable USB DRC on the Cubieboard

Enable the otg/drc usb controller on the Cubieboard. Note that the
5V of the otg is directly connected to the general 5V, so we only use
the id pin.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>