Input: xpad - refactor using BIT() macro

reduces the amount of magic numbers and makes the code more readable

Signed-off-by: Pavel Rojtberg <rojtberg@gmail.com>
Link: https://lore.kernel.org/r/20220913213133.584979-2-rojtberg@gmail.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>