ASoC: codecs: wcd938x: fix unused variable warning

This patch fixes below

	warning: unused variable wcd938x_dt_match

by placing device match table under CONFIG_OF
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210621134502.19537-1-srinivas.kandagatla@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd938x.c

@@ -3713,12 +3713,14 @@ static int wcd938x_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#if defined(CONFIG_OF)
 static const struct of_device_id wcd938x_dt_match[] = {
 	{ .compatible = "qcom,wcd9380-codec" },
 	{ .compatible = "qcom,wcd9385-codec" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, wcd938x_dt_match);
+#endif
 
 static struct platform_driver wcd938x_codec_driver = {
 	.probe = wcd938x_probe,