[media] media: mt9m111: add device-tree documentation

Micron 1.3Mp CMOS Digital Image Sensor

The Micron MT9M111 is a CMOS active pixel digital image sensor with an active

array size of 1280H x 1024V. It is programmable through a simple two-wire serial

interface.

Required Properties:

- compatible: value should be "micron,mt9m111"

For further reading on port node refer to

Documentation/devicetree/bindings/media/video-interfaces.txt.

Example:

	i2c_master {

		mt9m111@5d {

			compatible = "micron,mt9m111";

			reg = <0x5d>;

			remote = <&pxa_camera>;

			port {

				mt9m111_1: endpoint {

					bus-width = <8>;

					remote-endpoint = <&pxa_camera>;

				};

			};

		};

	};