Input: wacom - collect device quirks into single function

Collect device-specific code into a single function, and use quirks to
flag specific behavior instead.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>