input: touchscreen: fusion: add device tree integration

Add device tree integration and add the device to the dtb.

i2c device, interrupt and reset GPIO can be specified in the dts as follows:
Note that additionally you may have to set the pinmuxing for the pins to
be GPIO.

&i2c1 {
	status = "okay";

	pcap@10 {
		/* TouchRevolution Fusion 7 and 10 multi-touch controller */
		compatible = "touchrevolution,fusion-f0710a";
		reg = <0x10>;
		gpios = <&gpio6 10 0 /* MXM-11, Pen down interrupt */
			 &gpio6  9 0 /* MXM-13, Reset interrupt */
			>;
	};

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