msmnile_au: audio bring-up changes on auto platform

Initial changes to bring-up audio on automotive
platform, which include:

1. Add automotive snd card support in hw info.
2. Rename mixer_paths for automotive adp and custom
   snd card variant support.
3. Makefile update to load ADP acdb files for calibration.
4. Audio platform info override for acdb_id, pcm_id and
   backend selection.

Change-Id: I97f64c6f917e58070bbac90051f048b826eb8575