Fix crash when using VibratorManagerService before system ready

VibratorManagerService depends on some system services like Vibrator,
AudioManager and InputManager, which can only be initialized
onBootPhase.

Move only the initialization of these services to the onBootPhase and
allow the VibratorManagerService to be used before that without
crashing.

Fix: 180699899
Test: VibratorManagerServiceTest
Change-Id: Id6406373d7a7f15265aa6c1ce5b7ef39bb949eed