Set initial user on CarServiceHelper.

Test: atest CarHelperServiceTest
Test: adb shell dumpsys car_service --services CarUserService\
      |grep 'Initial user'
Test: adb shell cmd car_service get-initial-user

Bug: 153104923
Bug: 153104378

Change-Id: I89b3aebbb7713516a25ab9c543aa9f448a8912cd
4 files changed
tree: 00be54267b3e3be88c073eb10c77905710228b17
  1. src/
  2. tests/
  3. Android.bp
  4. OWNERS