HID: wacom: Add BTN_TOOL_FINGER for pad button reporting

Without this patch xf86-input-wacom driver wasn't able to properly recognise
pad button events. It was also causing some problems with button mapping.

Signed-off-by: Przemo Firszt <przemo@firszt.eu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
index 75ea66a..12dcda5 100644
--- a/drivers/hid/hid-wacom.c
+++ b/drivers/hid/hid-wacom.c
@@ -142,6 +142,7 @@
 		wdata->butstate = rw;
 		input_report_key(input, BTN_0, rw & 0x02);
 		input_report_key(input, BTN_1, rw & 0x01);
+		input_report_key(input, BTN_TOOL_FINGER, 0xf0);
 		input_event(input, EV_MSC, MSC_SERIAL, 0xf0);
 		input_sync(input);
 	}