Merge changes from topic "ms52-movenetstats"

* changes:
  Update API files to unhide MATCH_PROXY.
  Update tests for NetworkStats code move.
  Add setPollForce to module API
  Add JNI stats libraries to apex Android.bp
  Add JNI stats libraries to connectivity
  [MS62.2] Add NetworkStatsService into service initializer
  [MS54.8] Add hiddenapi-unsupported-t.txt to apex Android.bp
  [MS54.3] Move NetworkStats to updatable sources