Input: synaptics - remove obsolete min/max quirk for X240

The firmware of the X240 (LEN0035, 2013/12) exposes the same values
    x [1232..5710], y [1156..4696]
as the quirk applies.

Cc: stable@vger.kernel.org
Signed-off-by: Daniel Martin <consume.noise@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>