ACPI: add AC/DC notifier

Add an ACPI event notifier for AC/DC connect/disconnect events.

Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 98b9690..b6ed60b 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -245,6 +245,7 @@
 		acpi_bus_generate_netlink_event(device->pnp.device_class,
 						  dev_name(&device->dev), event,
 						  (u32) ac->state);
+		acpi_notifier_call_chain(device, event, (u32) ac->state);
 #ifdef CONFIG_ACPI_SYSFS_POWER
 		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 #endif