watchdog: bcm47xx: Simplify using devm_watchdog_register_device()

This allows to drop the .remove() function as it only exists to
unregister the watchdog device which is now done in a callback
registered by devm_watchdog_register_device().
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230307070404.2256308-2-u.kleine-koenig@pengutronix.deSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/bcm47xx_wdt.c

@@ -202,7 +202,7 @@ static int bcm47xx_wdt_probe(struct platform_device *pdev)
 	watchdog_set_restart_priority(&wdt->wdd, 64);
 	watchdog_stop_on_reboot(&wdt->wdd);
 
-	ret = watchdog_register_device(&wdt->wdd);
+	ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdd);
 	if (ret)
 		goto err_timer;
 
@@ -218,21 +218,11 @@ static int bcm47xx_wdt_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int bcm47xx_wdt_remove(struct platform_device *pdev)
-{
-	struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
-
-	watchdog_unregister_device(&wdt->wdd);
-
-	return 0;
-}
-
 static struct platform_driver bcm47xx_wdt_driver = {
 	.driver		= {
 		.name	= "bcm47xx-wdt",
 	},
 	.probe		= bcm47xx_wdt_probe,
-	.remove		= bcm47xx_wdt_remove,
 };
 
 module_platform_driver(bcm47xx_wdt_driver);