dt-bindings: usb: add DT binding for s3c2410 USB OHCI controller

Samsung S3C2410 and compatible SoC USB controller

OHCI

Required properties:

 - compatible: should be "samsung,s3c2410-ohci" for USB host controller

 - reg: address and lenght of the controller memory mapped region

 - interrupts: interrupt number for the USB OHCI controller

 - clocks: Should reference the bus and host clocks

 - clock-names: Should contain two strings

		"usb-bus-host" for the USB bus clock

		"usb-host" for the USB host clock

Example:

usb0: ohci@49000000 {

	compatible = "samsung,s3c2410-ohci";

	reg = <0x49000000 0x100>;

	interrupts = <0 0 26 3>;

	clocks = <&clocks UCLK>, <&clocks HCLK_USBH>;

	clock-names = "usb-bus-host", "usb-host";

};