Make system UI settings work for multi-user (2/2)

Change-Id: I88ab9fa0cb7791c5f9d859ab6531346f2aa55193
settings: Privacy Guard support

 * Add toggle to InstalledAppDetails to enable/disable privacy guard flag on
   a per-application basis.
 * Add toggle to enable privacy guard by default for applications.

Change-Id: If03aa5319c520b6c4a78887f0f46ef1443ddaa83
Merge "Make system UI settings work for multi-user (2/2)" into cm-10.1