Override invalid pen based pktlen and x/y_max with touch
values from HID report.

Since active area of pen and touch are same on these
devices, set physical x/y size while pen x/y_max and
resolution are still valid.
Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>