Create VibratorServiceTest

Add basic tests to cover main interaction between VibratorService.java
and it's native methods, which will be changed after vibrator HAL
controller is integrated.

Bug: 153418251
Test: atest FrameworksServicesTests:VibratorServiceTest
Change-Id: Ib0122a67d08e380501b71a8652bd4202aae7c002