RT8092XXX regulators

Required properties:
- compatible: "richtek,rt8092"
- reg: I2C slave address
- Vout-max: Max output voltage limit in uV programmed into the IC
- Vout-max: Min output voltage limit in uV programmed into the IC

Optional properties:
- Vsel-high: Indicates the VSEL pin is high.
  If this property is missing, assume the VSEL pin is low(0).

Any standard regulator properties can be used to configure the single regulator.

Example:

	i2c2 : i2c@80051f00{
		vsys_rt8092_reg: rt8092@1c{
			compatible = "richtek,rt8092";
			reg = <0x1c>;
			Vout-min = <1150000>;
			Vout-max = <1300000>;
			status = "okay";

			regulators {
				vsys_v1p3: rt8092_reg {
					regulator-name = "VSYS";
					regulator-min-microvolt = <1200000>;
					regulator-max-microvolt = <1400000>;
					regulator-always-on;
				};
			};
		};
	};


