[BUG] "No source info" in check-signal-stop-start-playback-50 #6431

Describe the bug
This is one specific issue we have been tracking as part of #6220

Issues has been rootcaused to incorrect clearing of mixer module state in reset and identified by following log in FW log:

[ 2.019000] mixer: No source info
[ 2.019000] pipe: pipeline_copy(): ret = -22, start->comp.id = 262145, dir = 1
[ 2.019000] pipe: pipeline_task(): xrun recovery failed! pipeline is stopped.

Reproduction Rate
100%

Expected behavior
No error from firmware.

Impact
Showstopper

Environment
SOF main as tested in 17th Oct daily tests.