n update for abituguru

Documentation update for the new bank1_types module param.

Also add what we know about different revisions of the uGuru and
a note that the abituguru driver unfortunatly does not work with the
latest and greatest motherboards, which have what I think is revision
4 of the uGuru.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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