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

Example:

&dsi {
	status = "okay";

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