input: qcom-hv-haptics: detect 5V variant and update gain setting

PM8350B has a variant which only supports haptics with Vmax up to 5V.
Detect this variant and update Vmax settings accordingly to make sure
the gain setting change can be correctly reflected.

Change-Id: I916fba21d8a441b9e95edeef5af715d451ba70cf
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>