hal: update snd device selection in auto hal

Use BUS device associated usecases for SND
device selection on automotive platform.

The criteria for SND device selection are
* HFP calls: usecase->id;
* NON HFP calls: out->car_audio_stream.

Change-Id: If5eb1283e6bfec074efceb4f545a28fdd3dbf601
Signed-off-by: Guodong Hu <guodhu@codeaurora.org>