Input: wacom_i2c - use macros for the bit masks

To make the code easier to read use macros for the bit masks.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Link: https://lore.kernel.org/r/20211009113707.17568-2-alistair@alistair23.me


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