Drop Lockscreen vibrate option [2/2]

It doesn't make sense to keep haptic feedback on, but
disable it only for that little unlock icon.
This option didn't do anything more than that.
Let's drop it and don't confuse users.

Change-Id: I0211deea61b2d5b048deb118c30fc1397a56d3ee

Conflicts:

	res/xml/security_settings_cyanogenmod.xml
	src/com/android/settings/SecuritySettings.java