devicetree: Add ANX7814 SlimPort transmitter binding

Analogix ANX7814 SlimPort (Full-HD Transmitter)

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The ANX7814 is an ultra-low power Full-HD (1080p60) SlimPort transmitter

designed for portable devices.

Required properties:

 - compatible		: "analogix,anx7814"

 - reg			: I2C address of the device

 - interrupt-parent	: Should be the phandle of the interrupt controller

			  that services interrupts for this device

 - interrupts		: Should contain the INTP interrupt

 - hpd-gpios		: Which GPIO to use for hpd

 - pd-gpios		: Which GPIO to use for power down

 - reset-gpios		: Which GPIO to use for reset

Optional properties:

 - dvdd10-supply	: Regulator for 1.0V digital core power.

 - Video port for HDMI input, using the DT bindings defined in [1].

[1]: Documentation/devicetree/bindings/media/video-interfaces.txt

Example:

	anx7814: anx7814@38 {

		compatible = "analogix,anx7814";

		reg = <0x38>;

		interrupt-parent = <&gpio0>;

		interrupts = <99 IRQ_TYPE_LEVEL_LOW>;   /* INTP */

		hpd-gpios = <&pio 36 GPIO_ACTIVE_HIGH>;

		pd-gpios = <&pio 33 GPIO_ACTIVE_HIGH>;

		reset-gpios = <&pio 98 GPIO_ACTIVE_HIGH>;

		port {

			anx7814_in: endpoint {

				remote-endpoint = <&hdmi0_out>;

			};

		};

	};