HID: wacom: re-add accidentally dropped Lenovo PID

Dropped in the following commit:

commit a3e6f65 ("Input: wacom - keep wacom_ids ordered")

Reported-by: Hans Spath <[email protected]>
CC: [email protected]    # v3.17+
Signed-off-by: Benjamin Tissoires <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: bentiss

drivers/hid/wacom_wac.c

@@ -3026,6 +3026,7 @@ const struct hid_device_id wacom_ids[] = {
 	{ USB_DEVICE_WACOM(0x4004) },
 	{ USB_DEVICE_WACOM(0x5000) },
 	{ USB_DEVICE_WACOM(0x5002) },
+	{ USB_DEVICE_LENOVO(0x6004) },
 
 	{ USB_DEVICE_WACOM(HID_ANY_ID) },
 	{ }