iwl3945: enable stuck queue detection on 3945

We learn from
http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=1834 and
https://bugzilla.redhat.com/show_bug.cgi?id=589777
that 3945 can also suffer from a stuck command queue. Enable stuck queue
detection for iwl3945 to enable recovery in this case.
Signed-off-by: NReinette Chatre <reinette.chatre@intel.com>

drivers/net/wireless/iwlwifi/iwl-3945.c

@@ -2852,6 +2852,7 @@ static struct iwl_lib_ops iwl3945_lib = {
 	.isr = iwl_isr_legacy,
 	.config_ap = iwl3945_config_ap,
 	.manage_ibss_station = iwl3945_manage_ibss_station,
+	.recover_from_tx_stall = iwl_bg_monitor_recover,
 	.check_plcp_health = iwl3945_good_plcp_health,
 
 	.debugfs_ops = {