Input: tps6507x-ts - remove vref from platform data

Although defined in platform data, vref is not used anywhere.

Also remove model, irq, and clear_penirq as they are not used either.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

include/linux/input/tps6507x-ts.h

@@ -14,7 +14,6 @@
 /* Board specific touch screen initial values */
 struct touchscreen_init_data {
 	int	poll_period;	/* ms */
-	int	vref;		/* non-zero to leave vref on */
 	__u16	min_pressure;	/* min reading to be treated as a touch */
 	__u16	vendor;
 	__u16	product;