regulator: rtq2208: Switch back to use struct i2c_driver's .probe()

struct i2c_driver::probe_new is about to go away. Switch the driver to
use the probe callback with the same prototype.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230814210759.26395-1-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/rtq2208-regulator.c

@@ -574,7 +574,7 @@ static struct i2c_driver rtq2208_driver = {
 		.name = "rtq2208",
 		.of_match_table = rtq2208_device_tables,
 	},
-	.probe_new = rtq2208_probe,
+	.probe = rtq2208_probe,
 };
 module_i2c_driver(rtq2208_driver);