[roll pigweed] pw_presubmit: Add --override-gn-arg

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/107291

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 30b2230cafb9f88..8db3f98470b460f
Roller-URL: https://ci.chromium.org/b/8805437958396055761
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id4d6901ae99e7b840689431915c786507d7a8438
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107553
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>