Input: wacom - streamline 2-finger touch support

Clean up 2-finger touch support. This still needs to be converted to
proper multi-touch protocol.

Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/tablet/wacom_wac.h b/drivers/input/tablet/wacom_wac.h
index 69098a2..063f1af 100644
--- a/drivers/input/tablet/wacom_wac.h
+++ b/drivers/input/tablet/wacom_wac.h
@@ -80,9 +80,10 @@
 struct wacom_wac {
 	char name[64];
 	unsigned char *data;
-	int tool[2];
-	int id[2];
+	int tool[3];
+	int id[3];
 	__u32 serial[2];
+	int last_finger;
 	struct wacom_features features;
 	struct wacom_shared *shared;
 	struct input_dev *input;