Input: edt-ft5x06 - fix an i2c write for M09 support

The driver sends 3 bytes instead of 2 when accessing a register on the M09
firmware, so writing to gain seems to overflow into the offset register.
Signed-off-by: NRobert Woerle <robert@linuxdevelopment.de>
Acked-By: NSimon Budig <simon.budig@kernelconcepts.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/edt-ft5x06.c

@@ -271,7 +271,7 @@ static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
 		wrbuf[0] = addr;
 		wrbuf[1] = value;
 
-		return edt_ft5x06_ts_readwrite(tsdata->client, 3,
+		return edt_ft5x06_ts_readwrite(tsdata->client, 2,
 					wrbuf, 0, NULL);
 
 	default: