uboot-phytec

sunxi: defconfig: R40 boards: enable USB

Now that the USB PHY on the Allwinner R40 SoC is supported, enable USB
support for the two R40 boards U-Boot supports.
For this we need to add the GPIO pin that powers the USB port(s), also
enable the usual suspects (OHCI/EHCI support).

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>