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Turn vibrator off explicitly on waveforms when amplitude is zero
This makes sure the drive will be off for the period of time described in the waveform pattern with amplitude = 0. Bug: 172492945 Test: manual Change-Id: I604fea474b6b0b56ee6d16cacb4c4fc97cb7516a Merged-In: I753e4846fce3066b78e818afa5c794b113244ab0