Fix vendor session status on devices without vibrator service

Update SystemVibratorManager to return the session status unsupported on
devices without vibrator service available, which usually means the
device doesn't have a vibrator hardware.

Change-Id: I34cb4ffea3cb164c16cafc265a7343eae1d09613
Fix: 384007752
Flag: android.os.vibrator.vendor_vibration_effects
Test: VendorVibrationSessionTest