Setup crosslink before sending link force down message

Call switchtec_ntb_setup_crosslink() to try to setup the crosslink
before sending the link force down message to peer.
  - If the peer switch's NT link is still up and not aware of the local
    driver is being reloaded, the call to
    switchtec_ntb_setup_crosslink() will make the local crosslink
    properly configured and the force link down message sent to the peer
    switch to bring down the link.
  - Otherwise, the call to switchtec_ntb_setup_crosslink() would fail
    and link force down message not sent to the peer switch.

ntb_hw_switchtec.c

@@ -1988,6 +1988,7 @@ static int switchtec_ntb_add(struct device *dev,
 	 * still up. Tell them to force it down (it will go back up
 	 * once we register the ntb device).
 	 */
+	switchtec_ntb_setup_crosslink(sndev);
 	switchtec_ntb_send_msg(sndev, LINK_MESSAGE, MSG_LINK_FORCE_DOWN);
 
 	rc = ntb_register_device(&sndev->ntb);