Settings: Minimum Vibration Duration (2/2)

PS2: Remove from devices without vibration
PS3: Get correct value on re-entry.

Change-Id: I37238cf08141061bcca392e7deacfc0be23c3120

Conflicts:
	res/values/slim_strings.xml
	res/xml/sound_settings.xml
	src/com/android/settings/SoundSettings.java