ACPI / battery: call ACPI notifier chain in acpi_battery_notify

Allow other drivers to subscribe to battery status notifications.
Just like AC driver does.

Signed-off-by: Alexander Mezin <mezin.alexander@gmail.com>
Acked-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index bfec70f..9a2c63b 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -734,6 +734,7 @@
 	acpi_bus_generate_netlink_event(device->pnp.device_class,
 					dev_name(&device->dev), event,
 					acpi_battery_present(battery));
+	acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
 	/* acpi_battery_update could remove power_supply object */
 	if (old && battery->bat.dev)
 		power_supply_changed(&battery->bat);