Add support for multi-input across PIDs
Add 'wacom_setup_device_quirks' function to 2.6.30

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Allow Intuos to flag 'stylus_in_proximity' on 2.6.30

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Have Intuos check just WACOM_QUIRK_MULTI_INPUT bit