Disable in-band ringtone if HFP and HFPC are both connected

If both HFP and HFPC are connected, the in-band ringtone would occupy
the SCO connection when ringing, and make it problematic for the
remote AG device to route audio to us.

Cherry picked from wear to reduce code divergence

Bug: 263323082
Bug: 219801406
Tag: #stability
Test: manual
Change-Id: I2ccebeae70edf8e32f50a4caca30c066139f9a6b