Refactored CarServiceHelperService to use InitialUserSetter. am: c0287b4370 am: 4e23f78698 am: 7207772db1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/car/services/+/10830905

Change-Id: I1eb63e21f4a89ecec2709c1c6acf61f492dfedc8
tree: e67c2f26c6603f0ee5e8762a5a624a9ab089e94c
  1. src/
  2. tests/
  3. Android.bp
  4. OWNERS
  5. PREUPLOAD.cfg