Qualcomm SPM Regulators

spm-regulator is a regulator device which supports PMIC processor supply
regulators via the SPM module.

Required properties:
- compatible:      Must be "qcom,spm-regulator"
- reg:             Specifies the SPMI address and size for this regulator device
- regulator-name:  A string used as a descriptive name for the regulator

Required structure:
- A qcom,spm-regulator node must be a child of an SPMI node that has specified
	the spmi-slave-container property

All properties specified within the core regulator framework can also be used.
These bindings can be found in regulator.txt.

Example:
	qcom,spmi@fc4c0000 {

		qcom,pm8226@1 {
			spmi-slave-container;

			spm-regulator@1700 {
				compatible = "qcom,spm-regulator";
				regulator-name = "8226_s2";
				reg = <0x1700 0x100>;
				regulator-min-microvolt = <900000>;
				regulator-max-microvolt = <1275000>;
			};
		};
	};