Audio: Fix abnormal keytone playback during silent mode changing

Change-Id: I603dbf70615b25dfad846235b97be5eb2731617e
Origin-Change-Id: I29e8673bb8305d96d5adc0a7e82b9bb9bcb3e7de
Orig-Change-Id: I5240aa118d3eeb7c630b2e03abe5536c26e6a405
Signed-off-by: ezhao3X <ertaox.zhao@intel.com>
Signed-off-by: Jian Luo <jian.luo@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 19084