Switch to using input_set_capability() instead of using __set_bit() to
make clear what exactly kinds of events (EV_KEY, EV_REL) are being
declared.

Also drop redundant calls setting EV_ABS and ABS_X|Y|Z bits as that is
taken care by input_set_abs_params().

Link: https://lore.kernel.org/r/20240610164301.1048482-2-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>