Merge "Cache IMountService for isUserKeyUnlocked() calls." into nyc-dev
am: 36cbf5ca37

* commit '36cbf5ca378523bfa4f5394e39f5fcff2b2461de':
  Cache IMountService for isUserKeyUnlocked() calls.

Change-Id: I1ad2d1eba64a89e7a22dc86c7241f6f85a5f2a0b