disable aec on link until software aec is turned off
disable aec on link until software aec is turned off

BUG=chromium:224107
TEST=gmerge adhd and restart cras, check AEC control.

Change-Id: Id49fd297fe9a80365a0dd446c788ca4f78b42c3a
Reviewed-on: https://gerrit.chromium.org/gerrit/46581
Reviewed-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Tested-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Commit-Queue: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd