Input: da9052_tsi - remove unused mutex

Signed-off-by: Marcus Folkesson <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/touchscreen/da9052_tsi.c

···
 	struct da9052 *da9052;
 	struct input_dev *dev;
 	struct delayed_work ts_pen_work;
-	struct mutex mutex;
 	bool stopped;
 	bool adc_on;
 };