platform/x86: system76_acpi: Replace Fn+F2 function for OLED models

System76 laptops models with OLED displays do not support the default
Fn+F2 behavior of turning the embedded display on and off. Some models
instead introduce a new notify event that is used to lock the screen so
the OS will put the display in a low power state.

Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Link: https://lore.kernel.org/r/20211006202202.7479-3-tcrawford@system76.com


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