Update IUidObserver.onUidStateChanged to include procStateSeq.

This procStateSeq is associated with the process state change of
an uid and will help in identifying if network policy rules have been
updated for a process state change.

Bug: 27803922
Test: runtest -c com.android.server.am.ActivityManagerServiceTest
      frameworks-services
Change-Id: Iaab8d004f476b96f28d08c886c7b0a6b585b9fef