shill: Add constant for MAC address randomization toggle

Chrome will tell shill whether this feature should be enabled
based on user settings or enterprise policy.

BUG=chromium:579598
TEST=emerge

Change-Id: I55b84eadc1b9c7759d142b639e9b42486c803620
Reviewed-on: https://chromium-review.googlesource.com/338510
Reviewed-by: Samuel Tan <samueltan@chromium.org>
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Commit-Queue: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
1 file changed