HID: multitouch: Fix system-control buttons not working

Some laptops have system-control buttons (e.g. KEY_SLEEP) on the same
interface as a hid-multitouch touch-pad.

This commit fixes these buttons not working.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-multitouch.c

@@ -930,6 +930,7 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 	    field->application != HID_DG_PEN &&
 	    field->application != HID_DG_TOUCHPAD &&
 	    field->application != HID_GD_KEYBOARD &&
+	    field->application != HID_GD_SYSTEM_CONTROL &&
 	    field->application != HID_CP_CONSUMER_CONTROL &&
 	    field->application != HID_GD_WIRELESS_RADIO_CTLS &&
 	    !(field->application == HID_VD_ASUS_CUSTOM_MEDIA_KEYS &&