input: qcom-hv-haptics: notify HBOOST to keep VREG on during play

HAPTICS module controls the output voltage of HAPTICS_BOOST module
through hardware signals when playing a vibration. During FIFO mode
playing, HAPTICS module would request HAPTICS_BOOST module to turn
on/off the output based on FIFO empty status. HAPTICS_BOOST is turned
off when FIFO is empty and it's turned on again when more FIFO samples
are filled.

During this voltage transition request (off->on), HAPTICS_BOOST module
may have a race condition if this requests comes in rapid succession.
This can lead to its FSM getting stuck. To avoid this race condition,
notify HAPTICS_BOOST module to keep the output enabled until the
playing is stopped. This is done by triggering a PBS sequence through
a SDAM module.

Change-Id: I5cef13df7a1fa4608dd64d509c802e0bcfde6b92
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>