Device-Tree bindings for Rockchip MPP Service.

Required properties:
- compatible: the value must be "rockchip,mpp-service"

- rockchip,taskqueue-count: the value of queue nodes for task running
	the value must be between 1 and 8

- rockchip,resetgroup-count: the value of reset clk groups for device reset
	the value must be between 1 and 8

Example:
	mpp_srv: mpp_srv {
		compatible = "rockchip,mpp-service";
		rockchip,taskqueue-count = <1>;
		rockchip,resetgroup-count = <1>;
		status = "disabled";
	};