File _servicedata of Package chirp

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/kk7ds/chirp.git</param>
    <param name="changesrevision">bc56ae93ab3cd1d3d7d0f3e96b86e9b757155372</param>
  </service>
</servicedata>