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kpb: Fix draining task and LL conflict
KPB draining task is executed by low priority preemptible EDF thread. The task accesses KPB sink buffer and calls comp_copy() for component connected to sink. If LL thread preempts draining task that could result in broken state of sink buffer or component connected to sink. This fix prevents LL from preempting draining task in bad moment. Signed-off-by: Serhiy Katsyuba <serhiy.katsyuba@intel.com>
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