brick_lib: Update layout.conf defaults.

We migrated layout.conf on all board overlays. Lets do the same for
bricks.

BUG=brillo:397
TEST=manual: brillo build still works.
TEST=unittests.

Change-Id: Ie57ca8971b95ba69d2fa268ae4fdde8dedc6fcde
Reviewed-on: https://chromium-review.googlesource.com/266765
Trybot-Ready: Bertrand Simonnet <bsimonnet@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
2 files changed