Reverted CarServiceHelperService.runAsync() to use its own thread. am: a9a3d2690f am: 47deb4411f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/car/services/+/11971851

Change-Id: I75ab6311eecc3bee738dcf04cdfc81d048a0d950
tree: e67c2f26c6603f0ee5e8762a5a624a9ab089e94c
  1. src/
  2. tests/
  3. Android.bp
  4. OWNERS
  5. PREUPLOAD.cfg