Mediatek DTV ASOC MACHINE for mt5870

Required properties:
- compatible: "mediatek,mtk-snd-machine"
- mediatek DTV,platform: MT5870 ASoC platform
- pre_init_table: audio pre-init table path
- init_table: audio init table path

Example:

mtk-sound-machine {
		compatible = "mediatek,mtk-snd-machine";
		pre_init_table = "/config/audio/audio_pre_init.ini";
		init_table = "/config/audio/audio_init.ini";
	};
