Input: joydev - blacklist digitizers

BTN_TOUCH is not set by the wacom driver which causes it to be handled by the
joydev driver while the resulting device is broken. This causes problems with
applications that try to use a joystick device.

Ubuntu BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/300143



Signed-off-by: Tim Cole <tim.cole@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Amit Kucheria <amit.kucheria@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>