servo: Update owners to use the hwtools OWNERS group. BUG=None TEST=None Change-Id: Iea8487c02847d819474959024420b694e65f52e6 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/hdctools_firmware/+/6171829 Commit-Queue: Brian Nemec <bnemec@google.com> Tested-by: Keith Haddow <haddowk@chromium.org> Auto-Submit: Keith Haddow <haddowk@chromium.org> Reviewed-by: Brian Nemec <bnemec@google.com>