ASoC: Intel: glk_rt5682_max98357a: removed unused variables

Fix GCC warning with W=1

sound/soc/intel/boards/glk_rt5682_max98357a.c:256:48: warning:
‘constraints_channels’ defined but not used [-Wunused-const-variable=]
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200113210428.27457-5-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/glk_rt5682_max98357a.c

@@ -249,16 +249,6 @@ static const struct snd_pcm_hw_constraint_list constraints_rates = {
 	.mask = 0,
 };
 
-static const unsigned int channels[] = {
-	DUAL_CHANNEL,
-};
-
-static const struct snd_pcm_hw_constraint_list constraints_channels = {
-	.count = ARRAY_SIZE(channels),
-	.list = channels,
-	.mask = 0,
-};
-
 static unsigned int channels_quad[] = {
 	QUAD_CHANNEL,
 };