platform/surface: Migrate to serdev specific shutdown function

The motivation is stop using the callback .shutdown in
qca_serdev_driver.driver to make it possible to drop that.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/9682d206a1f375cd98e7dbfce4f1a83b4b345178.1765526117.git.u.kleine-koenig@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: ukleinek

drivers/platform/surface/aggregator/core.c

@@ -380,9 +380,9 @@ static int ssam_serdev_setup(struct acpi_device *ssh, struct serdev_device *serd
 
 /* -- Power management. ----------------------------------------------------- */
 
-static void ssam_serial_hub_shutdown(struct device *dev)
+static void ssam_serial_hub_shutdown(struct serdev_device *serdev)
 {
-	struct ssam_controller *c = dev_get_drvdata(dev);
+	struct ssam_controller *c = dev_get_drvdata(&serdev->dev);
 	int status;
 
 	/*
@@ -834,12 +834,12 @@ MODULE_DEVICE_TABLE(of, ssam_serial_hub_of_match);
 static struct serdev_device_driver ssam_serial_hub = {
 	.probe = ssam_serial_hub_probe,
 	.remove = ssam_serial_hub_remove,
+	.shutdown = ssam_serial_hub_shutdown,
 	.driver = {
 		.name = "surface_serial_hub",
 		.acpi_match_table = ACPI_PTR(ssam_serial_hub_acpi_match),
 		.of_match_table = of_match_ptr(ssam_serial_hub_of_match),
 		.pm = &ssam_serial_hub_pm_ops,
-		.shutdown = ssam_serial_hub_shutdown,
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 };