foxconn: use new qmi service(fox) to get firmware version

foxconn modules get firmware version:
Try with the new FOX service first. If FOX service failed, try with DMS service.
T99W175(vid:105b) ; T77W968(0489:e0b4 ; 0489:e0b5):
    qmi service: dms
T99W265(0489:e0da ; 0489:e0db):
    qmi service: fox

src/mm-broadband-modem-mbim.c

@@ -2910,6 +2910,7 @@ static const QmiService qmi_services[] = {
     QMI_SERVICE_PDS,
     QMI_SERVICE_LOC,
     QMI_SERVICE_PDC,
+    QMI_SERVICE_FOX,
 };
 
 static void allocate_next_qmi_client (GTask *task);