[1/2] Setting: 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)

PS2: Actually remove preference from tablets
PS3: Show option in all security categories
     (credit Cristiano Matos)
PS4: Rebase

Change-Id: I3d52b752415f48e5468db0804be5c2ff93a71e31

Conflicts:
	res/values/pa_strings.xml
	src/com/android/settings/SecuritySettings.java