Update logic to turn on voice interaction feature
Previously it's only controlled by a command line flag, now we are
introducing a finch experiment that would also be able to turn on
this feature.
This feature will also control if the container should scan
vendor partition for privileged apps to make a clean turning off.
BUG=b:34748079
TEST=locally build and push, check feature turned on or off
Review-Url: https://codereview.chromium.org/2860863002
Cr-Commit-Position: refs/heads/master@{#470041}
12 files changed
