platform/x86: asus-nb-wmi: Add keymap for MyASUS key

This event is triggered by pressing Fn+F12 on
ASUS Zenbook UX425JA

Map it to KEY_PROG1 to allow userspace to
configure it

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Link: https://lore.kernel.org/r/20220506122536.113566-2-luca.stefani.ge1@gmail.com


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