Input: synaptics - add min/max quirk for the ThinkPad W540

https://bugzilla.redhat.com/show_bug.cgi?id=1096436



Cc: stable@vger.kernel.org
Tested-and-reported-by:  <ajayr@bigfoot.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>