Move interaction with vibrator HAL outside VibratorController lock

The vibrator HAL is getting stuck to a call to IVibrator.on, which is
done inside the VibratorController.mLock. This causes any read call,
including toString, to be blocked on the vibrator HAL.

Also introduding more debug logs to the service and thread.

Bug: 205323128
Test: manual
Change-Id: I2783bc17782c19defe04d4298a165d84751ddde9