It appears that if we turn on 6-byte Lifebook protocol on
Panasonic CF-28 its touchpad is left alone and generates
standard 3-byte PS/2 data stream with relative packets
instead of being converted in 3-byte Lifebook protocol with
absolute coordinates - in other words what get what we need
to distinguish between touchscreen and touchpad.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>