Input: aiptek - add support for Genius G-PEN 560 tablet

USBHID driver only supports relative mode with this tablet so let aiptek
module handle it.

Signed-off-by: Dmitry Guryanov <guryanov@dgap.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>