SOC MACHINE for mt5870

Required properties:
- compatible: "mediatek,dtv-iommu"
- iommu-cells : must be 1

Example:
	iommu: iommu {
		compatible = "mediatek,dtv-iommu";
		#iommu-cells = <1>;
	};

Example for a client device:
	iommu_test: iommu_test {
		compatible = "mediatek,dtv-iommu-test";
		iommus = <&iommu 0>;
	};

	ion_iommu: ion {
		compatible = "mediatek,dtv-iommu-ion";
		iommus = <&iommu 0>;
	};
Example for iommu cma:
	iommu-cma0 {
		compatible = "mediatek,dtv-iommu-cma0";
	};
	iommu-cma1 {
		compatible = "mediatek,dtv-iommu-cma1";
	};
