Qualcomm Technologies, Inc. SDExpress power control driver for SDX devices.

Required properties:
- compatible : "qcom,msm-sdexpress".
- <supply-name>-supply: phandle to the regulator device tree node
			Required "supply-name" are "vdd1" and "vdd2".
- sdexpress-gpios: sdexpress card detect gpio for card presence/absence.
- clkreq-gpios: PCI CLKREQ line gpio, to know its status.
- qcom,pcie-nvme-instance: The pcie instance number for nvme.

Optional properties:
In the following, <supply> can be vdd1 or vdd2.
- qcom,<supply>-always-on - specifies whether supply should be kept "on" always.
- qcom,<supply>-lpm_sup - specifies whether supply can be kept in low power mode
			(lpm).
- qcom,<supply>-voltage_level - specifies voltage levels for supply. Should be
				specified in pairs (min, max), units uV.
- qcom,<supply>-current_level - specifies load levels for supply in lpm or
				high power mode (hpm). Should be specified in
				pairs (lpm, hpm), units uA.

Examples:

	msm_sdexpress: qcom,msm-sdexpress {
		compatible = "qcom,msm-sdexpress";
		qcom,pcie-nvme-instance = <2>;

		vdd1-supply = <&vreg_sdex_vdd1>;
		qcom,vdd1-voltage-level = <2950000 2950000>;
		qcom,vdd1-current-level = <0 800000>;

		vdd2-supply = <&vreg_sdex_vdd2>;
		qcom,vdd2-voltage-level = <1800000 1800000>;
		qcom,vdd2-current-level = <0 10000>;

		sdexpress-gpios = <&pm8550_gpios 12 0>;
		clkreq-gpios = <&tlmm 56 0>;
	};
