Input: wacom_i2c - do not force interrupt trigger

Instead of forcing interrupt trigger to "level low" rely on the
platform to set it up according to how it is wired on the given
board.

Reviewed-by: Alistair Francis <alistair@alistair23.me>
Link: https://lore.kernel.org/r/20210321220043.318239-1-dmitry.torokhov@gmail.com


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