iwlwifi: "recover_from_tx_stall" function for 4965

"Recover from tx stall" function is available for all devices except
4965, here add the functionality to 4965.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -2286,6 +2286,7 @@ static struct iwl_lib_ops iwl4965_lib = {
 		.tx_stats_read = iwl_ucode_tx_stats_read,
 		.general_stats_read = iwl_ucode_general_stats_read,
 	},
+	.recover_from_tx_stall = iwl_bg_monitor_recover,
 	.check_plcp_health = iwl_good_plcp_health,
 };