build: telephony: Only include VoiceDialer in telephony builds

For WiFi only devices, they don't want this by default.

Change-Id: I4d07ab25d971f8a50beb84e2fd5f6d0bf1aeb8fe
Merge "build: telephony: Only include VoiceDialer in telephony builds" into cm-11.0
Merge pull request #18 from CyanogenMod/cm-11.0

sync fork