Ensure self-managed calls use voip audio mode.

Although Telecom ensures that new calls use voip audio mode, the default
value from a Connection would override the Telecom default.

Bug: 76362663
Test: Modify test app to ensure it does not set voip audio mode, ensure
Telecom uses voip audio mode for new calls.

Change-Id: Ie6477659cf6dabd08f371d4958ece1d258cd3106
1 file changed