rk3288 has two kind of usb controller, this add the dwc2 controller
for otg and host1.

Controller can works with usb PHY default setting and Vbus on.
Signed-off-by: NKever Yang <kever.yang@rock-chips.com>
Reviewed-by: NDoug Anderson <dianders@chromium.org>
Tested-by: NDoug Anderson <dianders@chromium.org>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>