iwlagn: handle bt defer work in 2000 series

For 2000 series, need to handle bt traffic changes when
receive notification from uCode
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-2000.c

@@ -265,7 +265,8 @@ static struct iwl_lib_ops iwl2000_lib = {
 	.txq_free_tfd = iwl_hw_txq_free_tfd,
 	.txq_init = iwl_hw_tx_queue_init,
 	.rx_handler_setup = iwlagn_rx_handler_setup,
-	.setup_deferred_work = iwlagn_setup_deferred_work,
+	.setup_deferred_work = iwlagn_bt_setup_deferred_work,
+	.cancel_deferred_work = iwlagn_bt_cancel_deferred_work,
 	.is_valid_rtc_data_addr = iwlagn_hw_valid_rtc_data_addr,
 	.load_ucode = iwlagn_load_ucode,
 	.dump_nic_event_log = iwl_dump_nic_event_log,