ARM: mvebu: armada-385-ap: Enable USB3 port

The Armada 385 AP board has a USB3 port exposed that uses a GPIO to drive the
VBUS line. Enable the needed drivers to support this.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>