dt-bindings: Add Multi-Inno MI0283QT binding

Multi-Inno MI0283QT display panel

Required properties:

- compatible:	"multi-inno,mi0283qt".

The node for this driver must be a child node of a SPI controller, hence

all mandatory properties described in ../spi/spi-bus.txt must be specified.

Optional properties:

- dc-gpios:	D/C pin. The presence/absence of this GPIO determines

		the panel interface mode (IM[3:0] pins):

		- present: IM=x110 4-wire 8-bit data serial interface

		- absent:  IM=x101 3-wire 9-bit data serial interface

- reset-gpios:	Reset pin

- power-supply:	A regulator node for the supply voltage.

- backlight:	phandle of the backlight device attached to the panel

- rotation:	panel rotation in degrees counter clockwise (0,90,180,270)

Example:

	mi0283qt@0{

		compatible = "multi-inno,mi0283qt";

		reg = <0>;

		spi-max-frequency = <32000000>;

		rotation = <90>;

		dc-gpios = <&gpio 25 0>;

		backlight = <&backlight>;

	};