Remove preinstalled from SYSTEM_ALERT_WINDOW

Adding installer, recents and appPredictor as they each currently have
critical dependencies on SAW.

Bug: 159616727
Bug: 173782393
Test: Manully verified that the permission is granted to the apps listed
above

Change-Id: I9e910cd66ae6760dd9669a5061535a9f00e8f1d4