Introduce a soong config for HFP HAL selection

For most Bluetooth transports (except USB), there's no need
to query HFP codec capabilities or configure SCO parameters.
This patch introduces a soong config that allows product
to select appropriate HFP HAL when necessary.

Note: this is based on ag/27953637.

Bug: 349136847
Test: m -j com.google.android.btservices
Flag: Exempt, build-only change, no change to default behavior
Change-Id: If3c465d66d8a69dfae360678cce50793a7a39fa1