This patch add multitouch support for the MacBookPro8,1 and
MacBookPro8,2 models.

Cc: stable@kernel.org
Signed-off-by: NAndy Botting <andy@andybotting.com>
Signed-off-by: NHenrik Rydberg <rydberg@euromail.se>
Acked-by: NJiri Kosina <jkosina@suse.cz>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>