arm64: dts: rockchip: add pd_usb3 power-domain node for rk3399

Add the usb3 power-domain, its qos area and assign it to the usb device
node.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>