uboot-imx

sunxi: Specify USB vbus pins for orangepi boards

This fixes the USB ports not working on the orangepi_plus and stops us
from messing with gpio-s which we should not touch on the orangepi_pc.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>