Input: add driver for TWL4030 vibrator device

TWL4030 Vibrator implemented via Force Feedback interface.
This uses MFD TWL4030 codec and own dynamic workqueue.

Signed-off-by: Jari Vanhala <ext-jari.vanhala@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>