Merge branch 'refs/heads/t/afh'

Merge branch 'refs/heads/t/afh'

A couple of patches which remove ->init of struct audio_format_handler
and struct receiver.

Cooking for 9 months.

* refs/heads/t/afh:
  Remove ->init() of struct receiver.
  afh: Constify definition of audio format handlers.
  afh: Introduce audio_format_names[].
  afh: Get rid of dummy entry at the end of afl[].
  afh: Minor simplification for afh_get_chunk().
  afh: Move audio_format_name() up.