ASoC: SOF: sof-audio: Fixes for widget prepare and

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

This series contains one fix (first patch) followed by a nice to have safety
belts in case we get a widget from topology which is not handled by SOF and will
not have corresponding swidget associated with.

diff --cc sound/soc/sof/sof-audio.c
Simple merge