floss: btclient: Prevent deadlock in telephony enable

    fn on_sdp_record_created(&mut self, record: BtSdpRecord, handle: i32) {

        print_info!("SDP record handle={} created", handle);

        if let BtSdpRecord::Mps(_) = record {

            self.context.lock().unwrap().mps_sdp_handle = Some(handle);

            let context = self.context.clone();

            // Callbacks first lock the DBus resource and then lock the context,

            // while the command handlers lock them in the reversed order.

            // `telephony enable` command happens to deadlock easily,

            // so use async call to prevent deadlock here.

            tokio::spawn(async move {

                context.lock().unwrap().mps_sdp_handle = Some(handle);

            });

        }

    }

}