Realtek rts39xx SoC USB OHCI controllers

Required properties:
- compatible : "realtek,rts3903-ohci"
- reg : ohci controller register range (address and length)
- interrupt-parent: Phandle of the parent interrupt controller
- interrupts : ohci controller interrupt
- resets: List of phandle and reset specifier pairs, one pair for
each reset signal that affects the device
- reset-names: List of reset signal name strings sorted in the same order as
the resets property

Example:

	usb_ohci: ohci@18180000 {
			compatible = "realtek,rts3903-ohci";
			reg = <0x18180000 0x1000>;
			interrupt-parent = <&cpuintc>;
			interrupts = <BSP_IRQ_USB>;
			resets = <&reset FORCE_RESET_U2HOST>;
			reset-names = "reset-usb-host";
	};
