Add information for the Positivo C4128B, a notebook/tablet convertible.

Link: https://github.com/onitake/gsl-firmware/pull/217


Signed-off-by: Renan Guilherme Lebre Ramos <japareaggae@gmail.com>
Link: https://lore.kernel.org/r/20231004235900.426240-1-japareaggae@gmail.com


Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>