platform/x86: lg-laptop: Remove LGEX0815 hotkey handling

The rfkill hotkey handling is already provided by the wireless-hotkey
driver. Remove the now unnecessary rfkill hotkey handling to avoid
duplicating functionality.

The ACPI notify handler still prints debugging information when
receiving ACPI notifications to aid in reverse-engineering.

Tested-by: Agathe Boutmy <agathe@boutmy.com>
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240606233540.9774-3-W_Armin@gmx.de
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>