File _servicedata of Package chirp

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/kk7ds/chirp.git</param>
    <param name="changesrevision">1581ba898d1d8baad5c212caaa9b71de9c32e1eb</param>
  </service>
</servicedata>