Merge changes I1148ab4e,I3e8c632d,I786d7281,Icbd87b35

* changes:
  libtimeinstate: export cputimeinstate.h
  libtimeinstate: add getCpuFreqs() function
  libtimeinstate: clear stale map values in startTrackingUidTimes()
  libtimeinstate: open maps write-only