Disable VoLTE if TTY is on and TTY is not supported over VoLTE

- VoLTE is disabled if TTY is turned on and it is not supported
  over VoLTE.
- Add API indicating whether VoLTE is enabled due to TTY restrictions.
  Uses configuration of VoLTE on TTY supported and current TTY mode.
- Move code changing Settings.Global.ENHANCED_4G_MODE_ENABLED
  from MobileNetworkSettings activity.

Bug: 18593974
Change-Id: Ib2706cf5f30412a735cc6f24228accc7f1216804
1 file changed
tree: af093e77161b7d31699d93b0f9baa911116b88e1
  1. src/
  2. Android.mk
  3. CleanSpec.mk
  4. README.txt