domx: add nBitsPerSample to FLAC

needed by updates to libstagefright

Change-Id: I4f8bb3cc1d3410472cbfa14cc4d91445b4da97f3
audio_wrapper: add more debugging-info

hopefully this helps to find the cause of "OK Google" everywhere causing
the audio-system to lock up sporadically.

Change-Id: I39ed4efa7a563e5fd592a44304a2257a12c23da7