[BUG][TGL][DSM] Unexpected samples at the end of rec file. #2701

Describe the bug
There is unexpected samples at the end of recorded file, when used DSM feature on TGL platform with nocodec mode.

Begining is OK:

Ending is not OK:

To Reproduce
terminal1: aplay -fS32_LE -r48000 -c2 -vv -i sine_48_2_32.wav
terminal2: arecord -fS32_LE -r48000 -c4 -vv rec.wav

Reproduction Rate
100%

Expected behavior
End of the recorded file shouldn't have such additional samples.

Environment
Kernel: thesofproject/linux topic/smart-amp (10b767431cbb)
Kconfig: kconfig-sof-nocodec.sh
FW: tgl-004-drop-stable (859110d)
Tplg: sof-tgl-smart-amplifier.m4 (rename it to sof-tgl-nocodec.tplg)
Platform:TGL

Logs
dsm-dmesg.txt
dsm-logger.txt