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

fix W=1 warning

sound/soc/codecs/cros_ec_codec.c:1056:36: warning:
'cros_ec_codec_acpi_id' defined but not used
[-Wunused-const-variable=]
 1056 | static const struct acpi_device_id cros_ec_codec_acpi_id[] = {
      |                                    ^~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200707190612.97799-11-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cros_ec_codec.c

@@ -1053,11 +1053,13 @@ static const struct of_device_id cros_ec_codec_of_match[] = {
 MODULE_DEVICE_TABLE(of, cros_ec_codec_of_match);
 #endif
 
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id cros_ec_codec_acpi_id[] = {
 	{ "GOOG0013", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, cros_ec_codec_acpi_id);
+#endif
 
 static struct platform_driver cros_ec_codec_platform_driver = {
 	.driver = {