ASoC: tas2562: skip of_device_id table when !CONFIG_OF

The driver can match by multiple methods.  Its of_device_id table is
referenced via of_match_ptr() so it will be unused for !CONFIG_OF
builds:

  sound/soc/codecs/tas2562.c:805:34: warning: ‘tas2562_of_match’ defined but not used [-Wunused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201125164452.89239-31-krzk@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tas2562.c

@@ -802,6 +802,7 @@ static const struct i2c_device_id tas2562_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, tas2562_id);
 
+#ifdef CONFIG_OF
 static const struct of_device_id tas2562_of_match[] = {
 	{ .compatible = "ti,tas2562", },
 	{ .compatible = "ti,tas2563", },
@@ -810,6 +811,7 @@ static const struct of_device_id tas2562_of_match[] = {
 	{ },
 };
 MODULE_DEVICE_TABLE(of, tas2562_of_match);
+#endif
 
 static struct i2c_driver tas2562_i2c_driver = {
 	.driver = {