Fixes for FBE behavior changes

+ This change ensures that the Dialer doesn't try to use the
ContactsPreferences object (which uses information in unavailable
storage) while in File based encryption locked mode. Without these
checks, the Dialer crashes on receiving an incoming call while FBE
locked.
+ Added Factory method to create ContactsPreferences for tests/while
FBE locked/while FBE unlocked
+ Added tests for CallCardPresenter and StatusBarNotifier FBE related
code

Bug=26822105

Change-Id: I5df93526e70b7350885c7261982945c32b7e86a0