Settings: Remove security preferences from lockscreen options.

    - Since we merged all security xml's, the container is now populated
    with preferences that we don't need within lockscreen security options.
    This patch removes the preferences.

Change-Id: I590df9293f293aa9048ce4c58813f449d88867b4
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0