ACPI: hotkey: remove driver, per feature-removal-schedule.txt

Signed-off-by: Len Brown <len.brown@intel.com>

include/acpi/acpi_drivers.h

@@ -105,12 +105,6 @@ int acpi_ec_ecdt_probe(void);
 
 int acpi_processor_set_thermal_limit(acpi_handle handle, int type);
 
-/* --------------------------------------------------------------------------
-                                    Hot Keys
-   -------------------------------------------------------------------------- */
-
-extern int acpi_specific_hotkey_enabled;
-
 /*--------------------------------------------------------------------------
                                   Dock Station
   -------------------------------------------------------------------------- */