Various fixes to fix CarServiceTest crash

- Force AudioPolicy into legacy mode. It cannnot access audio control hal
  with selinux and crashes.
- Clean CarLocalServices before starting test
- Better handle exception inside ICarImpl.init()

Bug: 129981298
Test: atest CarServiceTest
Change-Id: I15b9260bc40e9b4dc0085ab9dee8f17218341f4c
3 files changed