[media] Documentation: DT: Add OV5647 bindings

Omnivision OV5647 raw image sensor

---------------------------------

OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces

and CCI (I2C compatible) control bus.

Required properties:

- compatible		: "ovti,ov5647".

- reg			: I2C slave address of the sensor.

- clocks		: Reference to the xclk clock.

The common video interfaces bindings (see video-interfaces.txt) should be

used to specify link to the image data receiver. The OV5647 device

node should contain one 'port' child node with an 'endpoint' subnode.

Endpoint node mandatory properties:

- remote-endpoint: A phandle to the bus receiver's endpoint node.

Example:

	i2c@2000 {

		...

		ov: camera@36 {

			compatible = "ovti,ov5647";

			reg = <0x36>;

			clocks = <&camera_clk>;

			port {

				camera_1: endpoint {

					remote-endpoint = <&csi1_ep1>;

				};

			};

		};

	};