rtc: abx80x: switch to rtc_register_device

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

drivers/rtc/rtc-abx80x.c

@@ -614,12 +614,16 @@ static int abx80x_probe(struct i2c_client *client,
 	if (err)
 		return err;
 
-	rtc = devm_rtc_device_register(&client->dev, "abx8xx",
-				       &abx80x_rtc_ops, THIS_MODULE);
-
+	rtc = devm_rtc_allocate_device(&client->dev);
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
 
+	rtc->ops = &abx80x_rtc_ops;
+
+	err = rtc_register_device(rtc);
+	if (err)
+		return err;
+
 	i2c_set_clientdata(client, rtc);
 
 	if (client->irq > 0) {