MSM SuperSpeed USB3.0 SoC controller

Required properties :
- compatible : should be "qcom,dwc-usb3-msm"
- reg : offset and length of the register set in the memory map
	offset and length of the TCSR register for routing USB
	signals to either picoPHY0 or picoPHY1.
- interrupts: IRQ lines used by this controller
- <supply-name>-supply: phandle to the regulator device tree node
  Required "supply-name" examples are:
	"SSUSB_lp8" : 1.8v supply for SSPHY
	"HSUSB_1p8" : 1.8v supply for HSPHY
	"HSUSB_3p3" : 3.3v supply for HSPHY
	"vbus_dwc3" : vbus supply for host mode
	"ssusb_vdd_dig" : vdd supply for SSPHY digital circuit operation
	"hsusb_vdd_dig" : vdd supply for HSPHY digital circuit operation
- qcom,dwc-usb3-msm-dbm-eps: Number of endpoints avaliable for
  the DBM (Device Bus Manager). The DBM is HW unit which is part of
  the MSM USB3.0 core (which also includes the Synopsys DesignWare
  USB3.0 controller)
- qcom,vdd-voltage-level: This property must be a list of three integer
  values (no, min, max) where each value represents either a voltage in
  microvolts or a value corresponding to voltage corner

Optional properties :
- Refer to "Documentation/devicetree/bindings/arm/msm/msm_bus.txt" for
  below optional properties:
    - qcom,msm_bus,name
    - qcom,msm_bus,num_cases
    - qcom,msm_bus,active_only
    - qcom,msm_bus,num_paths
    - qcom,msm_bus,vectors
- interrupt-names : Optional interrupt resource entries are:
    "hs_phy_irq" : Interrupt from HSPHY for asynchronous events in LPM.
	This is not used if wakeup events are received externally (e.g. PMIC)
    "pmic_id_irq" : Interrupt from PMIC for external ID pin notification.
- qcom,otg-capability: If present then depend on PMIC for VBUS notifications,
  otherwise depend on PHY.
- qcom,charging-disabled: If present then battery charging using USB
  is disabled.
- qcom,dwc-hsphy-init: This property if present represents phy init
  value to be used for overriding HSPHY parameters into QSCRATCH register.
  This 32 bit value represents parameters as follows:
		bits 0-5   PARAMETER_OVERRIDE_A
		bits 6-12  PARAMETER_OVERRIDE_B
		bits 13-19 PARAMETER_OVERRIDE_C
		bits 20-25 PARAMETER_OVERRIDE_D
- qcom,skip-charger-detection: If present then charger detection using BC1.2
  is not supported and attached host should always be assumed as SDP.

Sub nodes:
- Sub node for "DWC3- USB3 controller".
  This sub node is required property for device node. The properties of this subnode
  are specified in dwc3.txt.

Example MSM USB3.0 controller device node :
	usb@f9200000 {
		compatible = "qcom,dwc-usb3-msm";
		reg = <0xf9200000 0xfc000>,
		      <0xfd4ab000 0x4>;
		interrupts = <0 133 0>;
		interrupt-names = "hs_phy_irq";
		ssusb_vdd_dig-supply = <&pm8841_s2_corner>;
		SSUSB_1p8-supply = <&pm8941_l6>;
		hsusb_vdd_dig-supply = <&pm8841_s2_corner>;
		HSUSB_1p8-supply = <&pm8941_l6>;
		HSUSB_3p3-supply = <&pm8941_l24>;
		vbus_dwc3-supply = <&pm8941_mvs1>;
		qcom,dwc-usb3-msm-dbm-eps = <4>
		qcom,vdd-voltage-level = <1 5 7>;
		qcom,dwc-hsphy-init = <0x00D195A4>;

		qcom,msm_bus,name = "usb3";
		qcom,msm_bus,num_cases = <2>;
		qcom,msm_bus,active_only = <0>;
		qcom,msm_bus,num_paths = <1>;
		qcom,msm_bus,vectors =
				<61 512 0 0>,
				<61 512 240000000 960000000>;
		dwc3@f9200000 {
			compatible = "synopsys,dwc3";
			reg = <0xf9200000 0xfc000>;
			interrupts = <0 131 0>, <0 179 0>;
			interrupt-names = "irq", "otg_irq";
			tx-fifo-resize;
};
	};