ASoC: ak4642: Drop no-op remove function

A remove callback that just returns 0 is equivalent to no callback at all
as can be seen in i2c_device_remove(). So simplify accordingly.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220603140513.131142-2-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/ak4613.c

@@ -919,18 +919,12 @@ static int ak4613_i2c_probe(struct i2c_client *i2c)
 				      &ak4613_dai, 1);
 }
 
-static int ak4613_i2c_remove(struct i2c_client *client)
-{
-	return 0;
-}
-
 static struct i2c_driver ak4613_i2c_driver = {
 	.driver = {
 		.name = "ak4613-codec",
 		.of_match_table = ak4613_of_match,
 	},
 	.probe_new	= ak4613_i2c_probe,
-	.remove		= ak4613_i2c_remove,
 	.id_table	= ak4613_i2c_id,
 };