ACPI: bus: Introduce acpi_bus_for_each_dev()

In order to avoid exposing acpi_bus_type to modules, introduce an
acpi_bus_for_each_dev() helper for iterating over all ACPI device
objects and make typec_link_ports() use it instead of the raw
bus_for_each_dev() along with acpi_bus_type.

Having done that, drop the acpi_bus_type export.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <[e-mail]>
Reviewed-by: Greg Kroah-Hartman <[e-mail]>
Reviewed-by: Heikki Krogerus <[e-mail]>

drivers/acpi/bus.c

···
 	.remove		= acpi_device_remove,
 	.uevent		= acpi_device_uevent,
 };
-EXPORT_SYMBOL_GPL(acpi_bus_type);
+
+int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
+{
+	return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
+}
+EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
 
 /* --------------------------------------------------------------------------
                              Initialization/Cleanup

drivers/usb/typec/port-mapper.c

···
 	if (!has_acpi_companion(&con->dev))
 		return 0;
 
-	bus_for_each_dev(&acpi_bus_type, NULL, &arg, typec_port_match);
+	acpi_bus_for_each_dev(typec_port_match, &arg);
 	if (!arg.match)
 		return 0;
 

include/acpi/acpi_bus.h

···
 /* acpi_device.dev.bus == &acpi_bus_type */
 extern struct bus_type acpi_bus_type;
 
+int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data);
+
 /*
  * Events
  * ------