HFP: Workaround for car kits that do not send AT+BAC command

HFP: Workaround for car kits that do not send AT+BAC command

* Some misbehaving HF devices (e.g. some Hyundai car kits) indicate
  their support on Wide Band Speech and Codec Negotiation, but do not
  send the required AT+BAC command during Service Level Connection
  setup. However, such car kits still expect Fluoride to do codec
  negotiation during SCO setup.
* This CL adds a workaround so that when HF indicates support for WBS
  and codec negotiation, Fluoride will attempt codec negotiation even
  though AT+BAC is never received.
* Store the SDP feature locally. If WBS is supported and no AT+BAC is
  received, use the SDP features to set the suported codec.

Bug: 77883405
Test: make, connect SCO to and from Hyundai car kits
Change-Id: I2be6007022183cac5b9006f37089a587b4a67372