Settings : Add volume link notification

Change-Id: I06027bc4f13c8a60b19a2b7ded73ce76da4e4f02

Tablets don't need to link volumes they don't have

This feature broke the notification volume slider in settings for
devices without telephony service (tablets) and isn't applicable
anyways since they don't have ringtone volume streams.

Change-Id: Ifff10ecd35b53f5fc08a36332814fb00d20b4350