Now support the 22" display and its updated firmware, including touch
width and height.

The number of touches can now go up to 60, and our single touch emulation
will fail when there are more than 6-7 touches; further work is needed on
this.
Signed-off-by: NStephane Chatty <chatty@enac.fr>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>