Settings: "Vibrate during call" requires VOICE_CAPABLE

No need to have this option available if you are on a wifi-only
device.

Change-Id: I30e91be73b5dd058c35ca4f5316563fa63d30d1c
Merge pull request #7 from CyanogenMod/cm-11.0

Settings: "Vibrate during call" requires VOICE_CAPABLE