iwlagn: initialize both tx/rx prio boost parameters

For config bt command, initialize both tx_prio_boost and
rx_prio_boost to "0".
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn-lib.c

@@ -1781,6 +1781,8 @@ void iwlagn_send_advance_bt_config(struct iwl_priv *priv)
 	bt_cmd.kill_ack_mask = priv->kill_ack_mask;
 	bt_cmd.kill_cts_mask = priv->kill_cts_mask;
 	bt_cmd.valid = priv->bt_valid;
+	bt_cmd.tx_prio_boost = 0;
+	bt_cmd.rx_prio_boost = 0;
 
 	/*
 	 * Configure BT coex mode to "no coexistence" when the