Revert "settings: Privacy Guard support"

This reverts commit e774dcccecf9e05bb56c9a76af6905371cf3f4e0.
Settings: Fix the SMS Limit setting location

We were saving a Settings.Global setting using Settings.Secure.putInt
this commit fixes it.

Change-Id: I00bb39a8798e66fb4db779bdd450bbc60657676a
Remove app security settings from lockscreen settings.

Change-Id: Id0f4c29bc52117b58392a35804c3cd2b3c7c631b
settings: Privacy Guard support

 * something15525: the last commit did not work too well, let's give this
   one a shot.
 * 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