labstation:  Add groups to the OWNERS

BUG=None
TEST=None

Change-Id: Ie0469388fbc127192e0f08635df9a96aaaa783a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/labstation/+/5386203
Tested-by: Keith Haddow <haddowk@chromium.org>
Auto-Submit: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Garry Wang <xianuowang@chromium.org>
Commit-Queue: Keith Haddow <haddowk@chromium.org>