[cq.cfg] Remove cq.cfg. It has been replaced by commit-queue.cfg in infra/config branch: https://skia.googlesource.com/skia/+/infra/config/commit-queue.cfg Bug: skia:8715 Change-Id: I1040da88e0ff65e0db2897d6a519622e22bdc09d Reviewed-on: https://skia-review.googlesource.com/c/188301 Reviewed-by: Eric Boren <borenet@google.com>