Input: wacom - add support for Intuos4 tablets

Signed-oof-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 f9c8b69..c10235a 100644
--- a/drivers/input/tablet/wacom_wac.h
+++ b/drivers/input/tablet/wacom_wac.h
@@ -25,6 +25,9 @@
 	INTUOS3S,
 	INTUOS3,
 	INTUOS3L,
+	INTUOS4S,
+	INTUOS4,
+	INTUOS4L,
 	CINTIQ,
 	WACOM_BEE,
 	WACOM_MO,