rtc: isl12022: stop using deprecated devm_rtc_device_register()

The comments say that devm_rtc_device_register() is deprecated and
that one should instead use devm_rtc_allocate_device() and
[devm_]rtc_register_device. So do that.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20220921114624.3250848-2-linux@rasmusvillemoes.dkSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-isl12022.c

@@ -246,10 +246,13 @@ static int isl12022_probe(struct i2c_client *client)
 
 	i2c_set_clientdata(client, isl12022);
 
-	isl12022->rtc = devm_rtc_device_register(&client->dev,
-					isl12022_driver.driver.name,
-					&isl12022_rtc_ops, THIS_MODULE);
-	return PTR_ERR_OR_ZERO(isl12022->rtc);
+	isl12022->rtc = devm_rtc_allocate_device(&client->dev);
+	if (IS_ERR(isl12022->rtc))
+		return PTR_ERR(isl12022->rtc);
+
+	isl12022->rtc->ops = &isl12022_rtc_ops;
+
+	return devm_rtc_register_device(isl12022->rtc);
 }
 
 #ifdef CONFIG_OF