dt-bindings: i2c: Add DT binding for I2C GENI driver

GENI based Qualcomm Technologies Inc Universal Peripheral version 3 (QUPv3)

								I2C controller

Required properties:

 - compatible: Should be:

   * "qcom,i2c-geni.

 - reg: Should contain QUP register address and length.

 - interrupts: Should contain I2C interrupt.

 - clocks: Serial engine core clock, and AHB clocks needed by the device.

 - pinctrl-names/pinctrl-0/1: The GPIOs assigned to this core. The names

   should be "active" and "sleep" for the pin confuguration when core is active

   or when entering sleep state.

 - #address-cells: Should be <1> Address cells for i2c device address

 - #size-cells: Should be <0> as i2c addresses have no size component

 - qcom,wrapper-core: Wrapper QUPv3 core containing this I2C controller.

Optional property:

 - qcom,clk-freq-out : Desired I2C bus clock frequency in Hz.

   When missing default to 400000Hz.

Child nodes should conform to i2c bus binding.

Example:

i2c@a94000 {

	compatible = "qcom,i2c-geni";

	reg = <0xa94000 0x4000>;

	interrupts = <GIC_SPI 358 0>;

	clock-names = "se-clk", "m-ahb", "s-ahb";

	clocks = <&clock_gcc GCC_QUPV3_WRAP0_S5_CLK>,

		<&clock_gcc GCC_QUPV3_WRAP_0_M_AHB_CLK>,

		<&clock_gcc GCC_QUPV3_WRAP_0_S_AHB_CLK>;

	pinctrl-names = "default", "sleep";

	pinctrl-0 = <&qup_1_i2c_5_active>;

	pinctrl-1 = <&qup_1_i2c_5_sleep>;

	#address-cells = <1>;

	#size-cells = <0>;

	qcom,wrapper-core = <&qupv3_0>;

	qcom,clk-freq-out = <400000>;

};