HID: ntrig: Emit TOUCH with DOUBLETAP for single touch

I squelched TipSwitch in a recent patch which resulted in the loss
of Touch events for single touch firmwares.  This patch just puts Touch back
in for single touch, and bundles it with DoubleTap (like the multitouch code).
The two events are used to convey the same message to different drivers.
Signed-off-by: NRafi Rubin <rafi@seas.upenn.edu>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-ntrig.c

@@ -173,6 +173,8 @@ static int ntrig_event (struct hid_device *hid, struct hid_field *field,
 			if (!nd->reading_mt) {
 				input_report_key(input, BTN_TOOL_DOUBLETAP,
 						 (nd->confidence != 0));
+				input_report_key(input, BTN_TOUCH,
+						 (nd->confidence != 0));
 				input_event(input, EV_ABS, ABS_X, nd->x);
 				input_event(input, EV_ABS, ABS_Y, nd->y);
 			}