input: qti-haptics: Add VMAX per effect setting

Currently, property "qcom,vmax-mv" is defined as the maximum output of
the haptics module to meet the requirement of the Vrms of the motor to
prevent it from damage. However, if the playing duration is short, it's
safe to overdrive the motor for an intense effect. Add "qcom,wf-vmax-mv"
per effect configuration to achieve this.

Change-Id: I96a48356bb9959cacf5e15cf614d89c774615312
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>