misc: ti_drv2667: Fix wave synthesis haptic mode

The vibration waveform becomes corrupt if it is
started before clearing the "go" bit. To avoid this
clear the go bit and restart the wave synthesis to
provide better vibration.

Change-Id: Ia2a2ec5bd261f7f7903e8576f901503c5a3e5beb
Signed-off-by: Alexander Lifshitz <califsh@codeaurora.org>
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>