File _servicedata of Package chirp

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/kk7ds/chirp.git</param>
    <param name="changesrevision">8d7cf0b140ee75ca1fa758df4b2ae23fe0dbfa3f</param>
  </service>
</servicedata>