Rockchip system monitor device tree bindings
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Required properties:
- compatible: Should be one of the following.
 - "rockchip,system-monitor"

Optional properties:
- rockchip,video-4k-offline-cpus: A string containing cpus which will be killed
			when play 4k video.
- rockchip,thermal-zone: A thermal zone node containing thermal sensor,
			it's used to get the current temperature.
- rockchip,polling-delay: The maximum number of milliseconds to wait
			between polls.
- rockchip,offline-cpu-temp: An integer indicating the trip temperature level.
- rockchip,temp-hysteresis: A low hysteresis value on rockchip,offline-cpu-temp
			property (above).
- rockchip,temp-offline-cpus: A string containing cpus which will be killed
			when temperature is high.

Example:

system-monitor {
	compatible = "rockchip,system-monitor";

	rockchip,thermal-zone = "soc-thermal";
	rockchip,polling-delay = <200>; /* milliseconds */
	rockchip,offline-cpu-temp = <110000>; /* millicelsius */
	rockchip,temp-offline-cpus = "2-3";

	rockchip,video-4k-offline-cpus = "2-3";
};