Mediatek MT6359 Regulator

Required properties:
- compatible: "mediatek,mt6359-regulator"
- mt6359regulator: List of regulators provided by this controller. It is named
  according to its regulator type, buck_<name> and ldo_<name>.
  The definition for each of these nodes is defined using the standard binding
  for regulators at Documentation/devicetree/bindings/regulator/regulator.txt.

The valid names for regulators are::
BUCK:
  buck_vs1, buck_vgpu11, buck_vmodem, buck_vpu, buck_vcore, buck_vs2,
  buck_vpa, buck_vproc2, buck_vproc1
LDO:
  ldo_vaud18, ldo_vsim1, ldo_vibr, ldo_vrf12, ldo_vusb, ldo_vsram_proc2,
  ldo_vio18, ldo_vcamio, ldo_vcn18, ldo_vfe28, ldo_vcn13, ldo_vcn33_1_bt,
  ldo_vcn13_1_wifi, ldo_vaux18, ldo_vsram_others, ldo_vefuse, ldo_vxo22,
  ldo_vrfck, ldo_vbif28, ldo_vio28, ldo_vemc, ldo_vcn33_2_bt, ldo_vcn33_2_wifi,
  ldo_va12, ldo_va09, ldo_vrf18, ldo_vsram_md, ldo_vufs, ldo_vm18, ldo_vbbck,
  ldo_vsram_proc1, ldo_vsim2

Example:
	pmic {
		compatible = "mediatek,mt6359";

		mt6359regulator: mt6359regulator {
			compatible = "mediatek,mt6359-regulator";

			mt6359_vs1_buck_reg: buck_vs1 {
				regulator-name = "vs1";
				regulator-min-microvolt = <800000>;
				regulator-max-microvolt = <2200000>;
				regulator-enable-ramp-delay = <0>;
				regulator-always-on;
			};
			mt6359_vgpu11_buck_reg: buck_vgpu11 {
				regulator-name = "vgpu11";
				regulator-min-microvolt = <400000>;
				regulator-max-microvolt = <1193750>;
				regulator-enable-ramp-delay = <200>;
				regulator-always-on;
				regulator-allowed-modes = <0 1 2>;
			};
			mt6359_vaud18_ldo_reg: ldo_vaud18 {
				compatible = "regulator-fixed";
				regulator-name = "vaud18";
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <1800000>;
				regulator-enable-ramp-delay = <240>;
			};
			mt6359_vsim1_ldo_reg: ldo_vsim1 {
				regulator-name = "vsim1";
				regulator-min-microvolt = <1700000>;
				regulator-max-microvolt = <3100000>;
				regulator-enable-ramp-delay = <480>;
			};
		};
	};