ASoC: da7219: 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/da7219.c:1705:34: warning: ‘da7219_of_match’ defined but not used [-Wunused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201125164452.89239-19-krzk@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/da7219.c

@@ -1702,11 +1702,13 @@ static struct snd_soc_dai_driver da7219_dai = {
  * DT/ACPI
  */
 
+#ifdef CONFIG_OF
 static const struct of_device_id da7219_of_match[] = {
 	{ .compatible = "dlg,da7219", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, da7219_of_match);
+#endif
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id da7219_acpi_match[] = {