platform/x86: add support for Advantech software defined button

platform/x86: add support for Advantech software defined button

Advantech sw_button is a ACPI event trigger button.

With this driver, we can report KEY_PROG1 on the
Advantech Tabletop Network Appliances products and it has been
tested in FWA1112VC.

Add the software define button support to report EV_REP key_event
(KEY_PROG1) by pressing button that could be get on user
interface and trigger the customized actions.

Signed-off-by: Andrea.Ho <Andrea.Ho@advantech.com.tw>
Link: https://lore.kernel.org/r/20210319034427.23222-1-andrea.cs97g@nctu.edu.tw
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>