dt-bindings: display: panel: Add support for Raydium RM67191 panel

Raydium RM67171 OLED LCD panel with MIPI-DSI protocol

Required properties:

- compatible: 		"raydium,rm67191"

- reg:			virtual channel for MIPI-DSI protocol

			must be <0>

- dsi-lanes:		number of DSI lanes to be used

			must be <3> or <4>

- port: 		input port node with endpoint definition as

			defined in Documentation/devicetree/bindings/graph.txt;

			the input port should be connected to a MIPI-DSI device

			driver

Optional properties:

- reset-gpios:		a GPIO spec for the RST_B GPIO pin

- v3p3-supply:		phandle to 3.3V regulator that powers the VDD_3V3 pin

- v1p8-supply:		phandle to 1.8V regulator that powers the VDD_1V8 pin

- width-mm:		see panel-common.txt

- height-mm:		see panel-common.txt

- video-mode:		0 - burst-mode

			1 - non-burst with sync event

			2 - non-burst with sync pulse

Example:

	panel@0 {

		compatible = "raydium,rm67191";

		reg = <0>;

		pinctrl-0 = <&pinctrl_mipi_dsi_0_1_en>;

		pinctrl-names = "default";

		reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;

		dsi-lanes = <4>;

		width-mm = <68>;

		height-mm = <121>;

		port {

			panel_in: endpoint {

				remote-endpoint = <&mipi_out>;

			};

		};

	};