OWNERS: allow copybara to update common.mk automatically

BUG=None
TEST=CQ passes

Change-Id: I7652613bdddee36675dc4e761d4f682ead53275a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/libevdev/+/6488467
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Sean O'Brien <seobrien@chromium.org>