btif_av: Pass vector parameter as const ref

   * @param reconf_ready_promise promise fulfilled when the reconfiguration done

   */

  bt_status_t SetPeerReconfigureStreamData(const RawAddress& peer_address,

                                           std::vector<btav_a2dp_codec_config_t> codec_preferences,

                                           const std::vector<btav_a2dp_codec_config_t>& codec_preferences,

                                           std::promise<void> reconf_ready_promise) {

    std::lock_guard<std::recursive_mutex> lock(btifavsource_peers_lock_);