BTA HF_CLIENT: Always reply to +BCS
Phones don't like when we don't reply to +BCS codec-negotiation. We were
having this behavior because not always do we want to accept a
connection request over SCO. Instead of not replying to +BCS (which is
essentially a codec negotiation) we rather refuse the SCO request when
it comes in. This creates other issues such as some phones trying to
connect SCO in an infinite loop but it still keeps interoperability with
other devices such as iPhones and Microsoft phones intact
Bug: b/
35469963
Bug: b/
35431871
Bug: b/
35419773
Test: SCO (Phone Audio) test with iPhone, Microsoft and Nexus phones
Change-Id: I5319edcb4da9d66c6d6b3a49742248c90dee98e6
(cherry picked from commit
ad372cfa3376f882046284a5655ed9c6fdf24daf)