IMS-VT: Do not allow adding call, holding video call when in video call

Disable <allow_holding_video_call> and <allow_add_call_during_video_call>
that does not allow adding call, holding video call when in video call.

IMS-VT: Do not allow Video Conferencing

Disable <support_video_conference_call_bool> configuration
flag to not allow video conferencing

Test: Manual
Bug: 67031055
Change-Id: I4a3093c506f8aef817628c9302b01399b6fb9446
1 file changed