Prune special labels from root project

These labels should never apply to the root project, but submit_filter
only applies to child projects. Add a submit_rule that only applies
to this root project so that commits are not blocked by the special
labels.

Change-Id: I3b7fda06667e277f56f0f63ef87a14c3dab38b66
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/+/1802316
1 file changed