rtc: stk17ta8: switch to rtc_register_device

This allows for future improvement of the driver.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-stk17ta8.c

@@ -328,11 +328,16 @@ static int stk17ta8_rtc_probe(struct platform_device *pdev)
 		}
 	}
 
-	pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
-				  &stk17ta8_rtc_ops, THIS_MODULE);
+	pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(pdata->rtc))
 		return PTR_ERR(pdata->rtc);
 
+	pdata->rtc->ops = &stk17ta8_rtc_ops;
+
+	ret = rtc_register_device(pdata->rtc);
+	if (ret)
+		return ret;
+
 	ret = sysfs_create_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
 
 	return ret;