Register VHAL to car watchdog

- For health checking, the car watchdog client attemps to get
PERF_VEHICLE_SPEED.
- If successful, it regards VHAL is healhty and responds to the car
watchdog daemon. Otherwise, VHAL will be killed by the daemon.

Bug: 154367059
Bug: 154262220
Test: dumpsys android.automotive.watchdog.ICarWatchdog/default and check
if vehicle hal is registered as a client

Change-Id: I2eb466550c56f25ba550ebbd35dc8fde9681ea59