[PATCH] USB: add new wacom devices to usb hid-core list

This patch adds support for DTF 521, Intuos3 12x12 and 12x19

Signed-off-by: Ping Cheng <pingc@wacom.com>
Acked-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>