usb: gadget: Add snapshot of ChipIdea MSM HSIC driver

USB HSIC Peripheral:

This describes device tree node for the USB HSIC Peripheral. This works with

usage of USB Device controller to enable USB HSIC Device mode functionality.

Required properties:

- compatible: should be "qcom,hsic-peripheral"

- regs : offset and length of the register set in the memory map

- interrupts: IRQ lines used by this controller

- <supply-name>-supply: handle to the regulator device tree node

  Required "supply-name" is "vdd" and optional "GDSC".

- 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 :

- qcom,usb-id-core: USB Core Index to be used to bind with gadget driver.

Example USB HSIC device node :

	hsic: hsic@f9a15000 {

		compatible = "qcom,hsic-peripheral";

		reg = <0xf9a15000 0x352>;

		interrupts = <0 136 0>;

		qcom,usb-id-core = <1>;

		vdd-supply = <&pmd9635_l2>;

		GDSC-supply = <&gdsc_usb_hsic>;

		qcom,vdd-voltage-level = <0 1200000 1200000>;

	};