ASoC: mt2701: remove unused variables

sound/soc/mediatek/mt2701/mt2701-afe-pcm.c:799:38: warning:
 mt2701_afe_o23_mix defined but not used [-Wunused-const-variable=]
sound/soc/mediatek/mt2701/mt2701-afe-pcm.c:803:38: warning:
 mt2701_afe_o24_mix defined but not used [-Wunused-const-variable=]
sound/soc/mediatek/mt2701/mt2701-afe-pcm.c:835:38: warning:
 mt2701_afe_multi_ch_out_i2s4 defined but not used [-Wunused-const-variable=]

They are never used, so can be removed.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190813143811.31456-1-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt2701/mt2701-afe-pcm.c

@@ -796,14 +796,6 @@ static const struct snd_kcontrol_new mt2701_afe_o22_mix[] = {
 	SOC_DAPM_SINGLE_AUTODISABLE("I19 Switch", AFE_CONN22, 19, 1, 0),
 };
 
-static const struct snd_kcontrol_new mt2701_afe_o23_mix[] = {
-	SOC_DAPM_SINGLE_AUTODISABLE("I20 Switch", AFE_CONN23, 20, 1, 0),
-};
-
-static const struct snd_kcontrol_new mt2701_afe_o24_mix[] = {
-	SOC_DAPM_SINGLE_AUTODISABLE("I21 Switch", AFE_CONN24, 21, 1, 0),
-};
-
 static const struct snd_kcontrol_new mt2701_afe_o31_mix[] = {
 	SOC_DAPM_SINGLE_AUTODISABLE("I35 Switch", AFE_CONN41, 9, 1, 0),
 };
@@ -832,11 +824,6 @@ static const struct snd_kcontrol_new mt2701_afe_multi_ch_out_i2s3[] = {
 				    PWR2_TOP_CON, 18, 1, 0),
 };
 
-static const struct snd_kcontrol_new mt2701_afe_multi_ch_out_i2s4[] = {
-	SOC_DAPM_SINGLE_AUTODISABLE("Multich I2S4 Out Switch",
-				    PWR2_TOP_CON, 19, 1, 0),
-};
-
 static const struct snd_soc_dapm_widget mt2701_afe_pcm_widgets[] = {
 	/* inter-connections */
 	SND_SOC_DAPM_MIXER("I00", SND_SOC_NOPM, 0, 0, NULL, 0),