Mediatek DTV DSP platform Controller for mt5870

Required properties:
- compatible: "mediatek,mtk-coprocessor-platform"
- mediatek DTV,platform: MT5870 ASoC platform

Example:

mtk-sound-coprocessor-platform {
		compatible = "mediatek,mtk-coprocessor-platform";
		dsp_name = "dsp.bin";
		miu_bank = <0>;
	};