We have added polled mode to the normal input devices with the intent of
retiring input_polled_dev. This converts sgi_btns driver to use
the polling mode of standard input devices and removes dependency on
INPUT_POLLDEV.

Link: https://lore.kernel.org/r/20191017204217.106453-15-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>