audio: improve mute duration

- redefine mute duration of primary output from 160ms to 40ms to avoid
  cutting of preview notification.

Bug: 233176336
Test: preview notification/voice end call tone

Signed-off-by: Jasmine Cha <chajasmine@google.com>
Change-Id: Ib696638eca99b1f58300533cca586cab209b188d
8 files changed