platform/x86: touchscreen_dmi: Enable pen support on the Chuwi Hi10 Plus and Pro

Both the Chuwi Hi10 Plus (CWI527) and the Chuwi Hi10 Pro (CWI529) tablets
support being used together with the Hi H2 pen.

Add the necessary properties to enable the new support for this in the
silead touchscreen driver.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20211225120247.95380-2-hdegoede@redhat.com