ACPI: fix ia64 allnoconfig build

drivers/acpi/event.c:238: error: conflicting types for ‘acpi_bus_generate_netlink_event’
include/acpi/acpi_bus.h:324: error: previous declaration of ‘acpi_bus_generate_netlink_event’ was here

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index cf6d516..a2b9304 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -233,8 +233,9 @@
 }
 
 #else
-int acpi_bus_generate_netlink_event(struct acpi_device *device, u8 type,
-				      int data)
+int acpi_bus_generate_netlink_event(const char *device_class,
+				      const char *bus_id,
+				      u8 type, int data)
 {
 	return 0;
 }