* USB2 ChipIdea USB controller for ci13xxx

Required properties:
- compatible: should be "chipidea,usb2"
- reg: base address and length of the registers
- interrupts: interrupt for the USB controller

Optional properties:
- clocks: reference to the USB clock
- phys: reference to the USB PHY
- phy-names: should be "usb-phy"
- vbus-supply: reference to the VBUS regulator

Example:

	usb@f7ed0000 {
		compatible = "chipidea,usb2";
		reg = <0xf7ed0000 0x10000>;
		interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&chip CLKID_USB0>;
		phys = <&usb_phy0>;
		phy-names = "usb-phy";
		vbus-supply = <&reg_usb0_vbus>;
	};