Fix 3148496: Initial pass at fragmentizing lockscreen settings.

This converts most of the existing activities to fragments and wraps
them in PreferenceActivities so they can be launched as before
(e.g. by a DevicePolicyManager)

Upload after sync/rebase.

Change-Id: I4f351b75d9fca0498bcb04b4e11ff3b70765a4ba
17 files changed