File _servicedata of Package chirp

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/kk7ds/chirp.git</param>
    <param name="changesrevision">ac7574adb5e1c93a2f7c32aa218b7974dd15b4e5</param>
  </service>
</servicedata>