message: Remove subscribe defvalue tag
diff: In the future, this should be the Identification of a module.
  </description>
  </param>
  - <param name="subscribe" type="Boolean" mandatory="false" defvalue="false">
  + <param name="subscribe" type="Boolean" mandatory="false">
  <description>
  If subscribe is true, the head unit will register onInteriorVehicleData notifications for the requested moduleType.
  If subscribe is false, the head unit will unregister onInteriorVehicleData notifications for the requested moduleType.
  