Input: pm8xxx-vib - parametrize the driver

In order to prepare this driver to support other vibrators of the same
kind, move some hardcoded values to a structure holding register
parameters (address, mask, shit of the control register).

Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>