builder_config: add new options for BuildImage step

Needed for asan and ubsan builders

BUG=chromium:1083491
TEST=regen

Change-Id: Ia7d906f282a101684936481e5258458ceea1171b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2225425
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
2 files changed