[automerger skipped] Update tools/ OWNERS to valid owners and remove noparent rule to allow for parent owners in cases where needed. am: c9bc3941 am: 7a1aff9d -s ours

am skip reason: skipped by user zyy

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16373401

Change-Id: If7dae55cbf761c9679e2cae0296fb239922e680b