CRAS: Enable Noise Cancellation as default

Enabled Noise Cancellation as default. This change has minimum impact
to users and is clean in code path without UI interaction, to help
collecting dogfooder feedbacks on delbin/drobit.

BUG=b:170281884
BUG=chromium:1199218
TEST=Manual test
TEST=FEATURES="test" emerge-volteer adhd

Change-Id: I82ad3038b636bf83fdb59ac16a7a70ed75c11c22
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/2921789
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Pin-chih Lin <johnylin@chromium.org>
Auto-Submit: Pin-chih Lin <johnylin@chromium.org>
Commit-Queue: Pin-chih Lin <johnylin@chromium.org>
(cherry picked from commit d4cef057d77ee2488e5928863ae02cd6e208804f)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/2942533
Reviewed-by: Pin-chih Lin <johnylin@chromium.org>
2 files changed