PackageManager: allow build-time disabling of components

Allow components to be specified as disabled at build time
(applied on boot).

This allows stock OTA components to be marked as disabled in
CM builds.

Change-Id: I6e4499cc40a779792a5ea97a10137399dad7d69f

Conflicts:
	core/res/res/values/config.xml
KeyguardViewMediator: Play lock screen sound sooner

When the screen is locked, there is a long pause before the lock
sound actually plays. This makes that sound happen much sooner.

Change-Id: I62547a183d68b93a33651c4078b5788d324055a9