This is purely cosmetic: this is standard 3-button, no wheel or other
such features, so it already _worked_ just fine.  This patch suppresses
a warning about the unknown model, and changes the printk from "Mouse"
to "TrackMan".
Signed-off-by: Peter Samuelson <peter@p12n.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>