HID: wacom: Add support for 3rd generation Intuos BT

Use the code path that predates generic device support.

Signed-off-by: Aaron Armstrong Skomra <skomra@gmail.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h
index 15d9c14..827d8fc4 100644
--- a/drivers/hid/wacom_wac.h
+++ b/drivers/hid/wacom_wac.h
@@ -213,6 +213,7 @@ enum {
 	INTUOSPM,
 	INTUOSPL,
 	INTUOSP2_BT,
+	INTUOSHT3_BT,
 	WACOM_21UX2,
 	WACOM_22HD,
 	DTK,