Settings: remove preference if device hasn't LockClock installed

Change-Id: I8b43501af12a3f4eba3a4ee87dbd416662639886
RemixSettings: Show the text on the bug report item
Add isPackageInstalled function that was missing
Merge remote-tracking branch 'settings/kitkat-staging' into kitkat-legacy-staging

Conflicts:
	src/com/android/settings/AOSPAL/LockscreenSettings.java