rtc: isl12022: use dev_set_drvdata() instead of i2c_set_clientdata()

As another preparation for removing direct references to the
i2c_client in the helper functions, stash a pointer to the private
data via dev_set_drvdata() instead of i2c_set_clientdata().
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20220921114624.3250848-7-linux@rasmusvillemoes.dkSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-isl12022.c

@@ -149,7 +149,7 @@ static int isl12022_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int isl12022_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct i2c_client *client = to_i2c_client(dev);
-	struct isl12022 *isl12022 = i2c_get_clientdata(client);
+	struct isl12022 *isl12022 = dev_get_drvdata(dev);
 	size_t i;
 	int ret;
 	uint8_t buf[ISL12022_REG_DW + 1];
@@ -232,8 +232,7 @@ static int isl12022_probe(struct i2c_client *client)
 				GFP_KERNEL);
 	if (!isl12022)
 		return -ENOMEM;
-
-	i2c_set_clientdata(client, isl12022);
+	dev_set_drvdata(&client->dev, isl12022);
 
 	isl12022->rtc = devm_rtc_allocate_device(&client->dev);
 	if (IS_ERR(isl12022->rtc))