Device-Tree bindings for regulators of Active-semi ACT8945A Multi-Function Device

Required properties:
 - compatible: "active-semi,act8945a", please refer to ../mfd/act8945a.txt.

Optional properties:
- active-semi,vsel-high: Indicates if the VSEL pin is set to logic-high.
  If this property is missing, assume the VSEL pin is set to logic-low.

Optional input supply properties:
  - vp1-supply: The input supply for REG_DCDC1
  - vp2-supply: The input supply for REG_DCDC2
  - vp3-supply: The input supply for REG_DCDC3
  - inl45-supply: The input supply for REG_LDO1 and REG_LDO2
  - inl67-supply: The input supply for REG_LDO3 and REG_LDO4

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

The valid names for regulators are:
	REG_DCDC1, REG_DCDC2, REG_DCDC3, REG_LDO1, REG_LDO2, REG_LDO3, REG_LDO4.

Example:
	pmic@5b {
		compatible = "active-semi,act8945a";
		reg = <0x5b>;
		status = "okay";

		active-semi,vsel-high;

		regulators {
			vdd_1v35_reg: REG_DCDC1 {
				regulator-name = "VDD_1V35";
				regulator-min-microvolt = <1350000>;
				regulator-max-microvolt = <1350000>;
				regulator-always-on;
			};

			vdd_1v2_reg: REG_DCDC2 {
				regulator-name = "VDD_1V2";
				regulator-min-microvolt = <1100000>;
				regulator-max-microvolt = <1300000>;
				regulator-always-on;
			};

			vdd_3v3_reg: REG_DCDC3 {
				regulator-name = "VDD_3V3";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-always-on;
			};

			vdd_fuse_reg: REG_LDO1 {
				regulator-name = "VDD_FUSE";
				regulator-min-microvolt = <2500000>;
				regulator-max-microvolt = <2500000>;
				regulator-always-on;
			};

			vdd_3v3_lp_reg: REG_LDO2 {
				regulator-name = "VDD_3V3_LP";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-always-on;
			};

			vdd_led_reg: REG_LDO3 {
				regulator-name = "VDD_LED";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-always-on;
			};

			vdd_sdhc_1v8_reg: REG_LDO4 {
				regulator-name = "VDD_SDHC_1V8";
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <1800000>;
				regulator-always-on;
			};
		};
	};