[2/2] Framework/base: Lockscreen maximized widgets

      Enable lockscreen widgets to be expanded by default.

      PA modifications to commit:
          Allow for long press unlock.
          Enable checkbox only if "Enable Widgets" is selected
          Remove preference is device is a tablet (already expanded)

Change-Id: I6a354d218fa5cc4603b92ba479d6aeba7f8f9c60