ACPI: drop redundant owner from acpi_driver

Once all .owner is removed from all acpi_driver instances, drop it from
the structure.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/acpi/acpi_bus.h

@@ -170,7 +170,6 @@ struct acpi_driver {
 	unsigned int flags;
 	struct acpi_device_ops ops;
 	struct device_driver drv;
-	struct module *owner;
 };
 
 /*