[PATCH] USB: wacom tablet driver update

This patch adds support for DTF 521, Intuos3 12x12, and 12x19;
           fixes minor data report bugs.
Signed-off-by: Ping Cheng <pingc@wacom.com>
Acked-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>