ASoC: intel: soc-acpi-intel-icl-match: remove useless 'rt1308_2_adr'

Fix the following gcc warning:

sound/soc/intel/common/soc-acpi-intel-icl-match.c:90:45: warning:
‘rt1308_2_adr’ defined but not used [-Wunused-const-variable=]
 static const struct snd_soc_acpi_adr_device rt1308_2_adr[] = {
                                             ^~~~~~~~~~~~
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200410081117.21319-1-yanaijie@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/common/soc-acpi-intel-icl-match.c

@@ -87,14 +87,6 @@ static const struct snd_soc_acpi_adr_device rt1308_1_adr[] = {
 	}
 };
 
-static const struct snd_soc_acpi_adr_device rt1308_2_adr[] = {
-	{
-		.adr = 0x000210025D130800,
-		.num_endpoints = 1,
-		.endpoints = &single_endpoint,
-	}
-};
-
 static const struct snd_soc_acpi_adr_device rt1308_1_group1_adr[] = {
 	{
 		.adr = 0x000110025D130800,