audio/hda: detect output buffer overruns

If some event caused some larger playback hickup the fine-grained timer
adjust isn't able to recover.  Use a buffer overruns as indicator for
that.  Reset timer adjust logic in case we detected one.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20180622111200.30561-5-kraxel@redhat.com