Enable VoLTE/VT with overlay overrides.
Enable VoLTE/VT with overlay overrides.

This reverts commit 5acf587392f4d5f2aec9d0dac1f1261566573396.

Bug: 17134661
Change-Id: I48c9ba6c9ecbb16c8acb54453f8cd145305d037c

md5555/android_packages_services_Telephony