dt-bindings: devfreq: Add DT bindings for ARM memlat driver

ARM CPU memory latency monitor device

arm-memlat-mon is a device that represents the use of the PMU in ARM cores

to measure the parameters for latency driven memory access patterns.

Required properties:

- compatible:			Must be "qcom,arm-memlat-mon"

- qcom,cpulist:			List of CPU phandles to be monitored in a cluster

- qcom,target-dev:		The DT device that corresponds to this master port

- qcom,core-dev-table:		A mapping table of core frequency to a required bandwidth vote at the

				given core frequency.

Optional properties:

- qcom,cachemiss-ev:		The cache miss event that this monitor is supposed to measure.

				Defaults to 0x17 if not specified.

- qcom,inst-ev:			The instruction count event that this monitor is supposed to measure.

				Defaults to 0x08 if not specified.

Example:

	qcom,arm-memlat-mon {

		compatible = "qcom,arm-memlat-mon";

		qcom,cpulist = <&CPU0 &CPU1>;

		qcom,target-dev = <&memlat0>;

		qcom,cachemiss-ev = <0x2A>;

		qcom,inst-ev = <0x08>;

		qcom,core-dev-table =

			<  300000 1525>,

			<  499200 3143>,

			< 1881600 5859>;

	};