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Lontium LT8912 MIPI-DSI to LVDS and HDMI/MHL bridge bindings

Required properties:
 - compatible: "lontium,lt8912"
 - reg: virtual channel id
 - reset-gpios: a GPIO spec for the reset pin
 - i2c-bus: phandle of an I2C controller used for register access
 - display-timings : Refer to binding doc display-timing.txt for details

Example:

&dsi {
	status = "okay";

	lt8912@0 {
		compatible = "lontium,lt8912";
		reg = <0>;
		reset-gpios = <&gpio0 RK_PA2 GPIO_ACTIVE_LOW>;
		i2c-bus = <&i2c1>;

		display-timings {
			native-mode = <&timing0>;

			timing0: timing0 {
				clock-frequency = <74250000>;
				hactive = <1280>;
				vactive = <720>;
				hfront-porch = <110>;
				hsync-len = <40>;
				hback-porch = <220>;
				vfront-porch = <5>;
				vsync-len = <5>;
				vback-porch = <20>;
				hsync-active = <0>;
				vsync-active = <0>;
				de-active = <0>;
				pixelclk-active = <0>;
			};
		};
	};
};