of: unittest: Switch i2c driver back to use .probe()

After commit b8a1a4cd ("i2c: Provide a temporary .probe_new()
call-back type"), all drivers being converted to .probe_new() and then
03c835f4 ("i2c: Switch .probe() to not take an id parameter") convert
back to (the new) .probe() to be able to eventually drop .probe_new() from
struct i2c_driver.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230525204812.733642-1-u.kleine-koenig@pengutronix.deSigned-off-by: Rob Herring <robh@kernel.org>

drivers/of/unittest.c

@@ -2686,7 +2686,7 @@ static struct i2c_driver unittest_i2c_dev_driver = {
 	.driver = {
 		.name = "unittest-i2c-dev",
 	},
-	.probe_new = unittest_i2c_dev_probe,
+	.probe = unittest_i2c_dev_probe,
 	.remove = unittest_i2c_dev_remove,
 	.id_table = unittest_i2c_dev_id,
 };
@@ -2763,7 +2763,7 @@ static struct i2c_driver unittest_i2c_mux_driver = {
 	.driver = {
 		.name = "unittest-i2c-mux",
 	},
-	.probe_new = unittest_i2c_mux_probe,
+	.probe = unittest_i2c_mux_probe,
 	.remove = unittest_i2c_mux_remove,
 	.id_table = unittest_i2c_mux_id,
 };