quickboot: Only enable QuickBoot if package is installed

 * Also move to Settings.Global

Change-Id: I87e1464d717b41437072523c0ecab52227d7888b

Conflicts:
	core/java/android/provider/Settings.java
	packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
	policy/src/com/android/internal/policy/impl/GlobalActions.java