minigbm: disable default Chromium style checks

minigbm: disable default Chromium style checks

Adding these hook overrides disables all of the default ChromiumOS
source style checks. This way repo upload . should just run
our presubmit script.

BUG=none
TEST=none

Change-Id: I18803f5a94ef4c17043dcb12c817e8cf78b64d66
Reviewed-on: https://chromium-review.googlesource.com/467646
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>