Allwinner sun4i A10 musb DRC/OTG controller
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Required properties:
 - compatible      : "allwinner,sun4i-a10-musb", "allwinner,sun6i-a31-musb",
                     "allwinner,sun8i-a33-musb" or "allwinner,sun8i-h3-musb"
 - reg             : mmio address range of the musb controller
 - clocks          : clock specifier for the musb controller ahb gate clock
 - reset           : reset specifier for the ahb reset (A31 and newer only)
 - interrupts      : interrupt to which the musb controller is connected
 - interrupt-names : must be "mc"
 - phys            : phy specifier for the otg phy
 - phy-names       : must be "usb"
 - dr_mode         : Dual-Role mode must be "host" or "otg"
 - extcon          : extcon specifier for the otg phy

Example:

	usb_otg: usb@01c13000 {
		compatible = "allwinner,sun4i-a10-musb";
		reg = <0x01c13000 0x0400>;
		clocks = <&ahb_gates 0>;
		interrupts = <38>;
		interrupt-names = "mc";
		phys = <&usbphy 0>;
		phy-names = "usb";
		extcon = <&usbphy 0>;
	};