Simple Digital Power Meter(SDPM) clock monitoring.

SDPM is used to monitor the operating frequency of different clocks and based
on operating levels of different clients, the Policy Engine will recommend a
new max operating level. The SDPM driver will register with the clock
framework for rate change notification of different clocks. These clock rate
will be updated to SDPM.

Properties:

- compatible:
	Usage: required
	Value type: <string>
	Definition: should be "qcom,sdpm"

- reg:
	Usage: required
	Value type: <u32>
	Definition: RDPM base address.

- clocks:
	Usage: required
	Value type: <prop-encoded-array>
	Definition: A List of phandle and clock specifier pairs as listed
			in clock-names property.

- clock-names:
	Usage: required
	Value type: <stringlist>
	Definition: List of clock names matching the clock order mentioned in
			the clocks property.

- <supply-name>-supply:
	Usage: Optional
	Value type: <regulator phandle>
	Definition: phandle to the regulator device tree node that powers
			this domain.

- csr-id:
	Usage: required
	Value type: <array of u32>
	Definition: Array of CSR ID matching the clock order mentioned in the
			clocks property.

Example:

cx_sdpm@0x00634000 {
	compatible = "qcom,sdpm";
	reg = <0x00634000 0x1000>;
	clock-names = "cam_cc_ipe", "compo_aux";
	clocks = <&clock_camcc CAM_CC_IPE_0_CLK_SRC>,
		<&clk_m_a2_div1 CLK_M_COMPO_AUX>;
	cam_cc_ipe-supply = <&cam_cc_ipe_0_gdsc>;
	csr-id = <5 7>;
	//CSR 5 <=> cam_cc
	//CSR 7 <=> compo_aux
};