Input: adp5588-keys - add support for fw properties

Input: adp5588-keys - add support for fw properties

Use firmware properties (eg: OF) to get the device specific
configuration. This change just replaces the platform data since there
was no platform using it and so, it makes no sense having both.

Special note to the PULL-UP disable setting that is now supported as
part of the gpio subsystem (using 'set_config()' callback).

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220829131553.690063-5-nuno.sa@analog.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>