File _servicedata of Package chirp

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/kk7ds/chirp.git</param>
    <param name="changesrevision">d5dbf01d39fafe7df6f29c61f21cbf7be72f2ce7</param>
  </service>
</servicedata>