add Custom Lockscreen switch

Change-Id: Icb96b85fb7ecf1b6716627f96f393f1fc9da09df
Add new themes items to personalization menu

Bring in logic for the new chooser. If TMO chooser is installed it will get
first priority.

Change-Id: Ia8e852e5e5ad2465d0b9b73f16c7080a7337bb8a