This noise issue is easily triggered by pause/release.

How to reproduce:

1. aplay -Dhw:0,5 -r 48000 -c 2 -f s16_le test.wav -i
2. press the space key to do pause/release

dmesg.log
rmbox.log
rmbox-t.log

Test env:
kernel-cros-sof-v4.14-rebase: e4bc814c982d5
sof-glk-003-drop-stable: f245831
soft-master:d77beaf8b