arm64: dts: rockchip: add usb2 nodes for RK3328 SoCs

This patch adds usb2 otg/host controllers and phys nodes
for Rockchip RK3328 SoCs.

Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>