ASoC: codecs: max98390: fix 'defined but not used' warning

Fix W=1 warning and removed unused table. In this case this a
duplicate of

static const struct of_device_id max98390_of_match[] = {
	{ .compatible = "maxim,max98390", },
	{}
};
MODULE_DEVICE_TABLE(of, max98390_of_match);

already used in the rest of the code.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200707190612.97799-13-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98390.c

@@ -944,14 +944,6 @@ static const struct regmap_config max98390_regmap = {
 	.cache_type       = REGCACHE_RBTREE,
 };
 
-#ifdef CONFIG_OF
-static const struct of_device_id max98390_dt_ids[] = {
-	{ .compatible = "maxim,max98390", },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, max98390_dt_ids);
-#endif
-
 static int max98390_i2c_probe(struct i2c_client *i2c,
 		const struct i2c_device_id *id)
 {