media: dt-bindings: Add jpeg enc device tree node document

* MediaTek JPEG Encoder

MediaTek JPEG Encoder is the JPEG encode hardware present in MediaTek SoCs

Required properties:

- compatible : "mediatek,mt2701-jpgenc"

  followed by "mediatek,mtk-jpgenc"

- reg : physical base address of the JPEG encoder registers and length of

  memory mapped region.

- interrupts : interrupt number to the interrupt controller.

- clocks: device clocks, see

  Documentation/devicetree/bindings/clock/clock-bindings.txt for details.

- clock-names: must contain "jpgenc". It is the clock of JPEG encoder.

- power-domains: a phandle to the power domain, see

  Documentation/devicetree/bindings/power/power_domain.txt for details.

- mediatek,larb: must contain the local arbiters in the current SoCs, see

  Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt

  for details.

- iommus: should point to the respective IOMMU block with master port as

  argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt

  for details.

Example:

	jpegenc: jpegenc@1500a000 {

		compatible = "mediatek,mt2701-jpgenc",

			     "mediatek,mtk-jpgenc";

		reg = <0 0x1500a000 0 0x1000>;

		interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_LOW>;

		clocks =  <&imgsys CLK_IMG_VENC>;

		clock-names = "jpgenc";

		power-domains = <&scpsys MT2701_POWER_DOMAIN_ISP>;

		mediatek,larb = <&larb2>;

		iommus = <&iommu MT2701_M4U_PORT_JPGENC_RDMA>,

			 <&iommu MT2701_M4U_PORT_JPGENC_BSDMA>;

	};