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>