t0lte: user configureable voice/streaming volumes [2/2]

relies on http://review.cyanogenmod.org/#/c/43834/

Change-Id: I03367bf0424257d906a6c8e059e4ca6d9faa7dec
DeviceSettings: fix enable/disable options that can be overlaid

Change-Id: Id2e1c11b6337bfbb26dc31ca0eb067a89b131a19

Conflicts:
	DeviceSettings/res/values/config.xml