dt-bindings: input: qcom-hv-haptics: Add initial binding document

Qualcomm Technologies, Inc. (QTI) High Voltage (HV) PMIC haptics
modules can support up to 10 V voltage to drive either ERM or LRA.
It has an integrated module to support auto resonance detection
and correction for LRA actuator. It can play different vibration
effects with different pattern sources. It also has an integrated
brake module which can work in different modes to use BEMF for
quick vibration stop.

Change-Id: Id8b9fa1e4eefc7dda325e25728e59af9c1de9049