Don't send BT state when silent ringing is requested

When silent ringing is requested by the call screening service, don't
send the call to the BT headset as a ringing call.

Fixes: 132201912
Test: unit
AOSP: Infeasible due to transitive dependencies on RoleManager
Change-Id: If326ef0b6d0b3e04a627888a05d815165722be20