Fix VoLTE toggle names for all carriers.

Change default from "Enhanced 4G LTE Mode" to "VoLTE".
Add 4g calling and its sub summary.
Show carreirs VoLTE toggle names by carrier config.

Bug: 129112234
Bug: 129153582
Test: Use commands to override carrier config to observe the
UI as expected.

Change-Id: I1d418873a661b3c20c5a6d0a056dcb2573742c65