ASoC: mediatek: mt8192: Make some symbols static

Fix the following sparse warnings:

./mt8192-dai-i2s.c:2040:5: warning: symbol 'mt8192_dai_i2s_get_share' was not declared. Should it be static?
./mt8192-dai-i2s.c:2060:5: warning: symbol 'mt8192_dai_i2s_set_priv' was not declared. Should it be static?
./mt8192-afe-gpio.c:15:16: warning: symbol 'aud_pinctrl' was not declared. Should it be static?
./mt8192-afe-pcm.c:70:5: warning: symbol 'mt8192_get_memif_pbuf_size' was not declared. Should it be static?
./mt8192-afe-pcm.c:2137:39: warning: symbol 'mt8192_afe_component' was not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Acked-by: Jiaxin Yu <jiaxin.yu@mediatek.com>
Link: https://lore.kernel.org/r/1604579287-25251-1-git-send-email-zou_wei@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8192/mt8192-afe-gpio.c

@@ -12,7 +12,7 @@
 #include "mt8192-afe-common.h"
 #include "mt8192-afe-gpio.h"
 
-struct pinctrl *aud_pinctrl;
+static struct pinctrl *aud_pinctrl;
 
 enum mt8192_afe_gpio {
 	MT8192_AFE_GPIO_DAT_MISO_OFF,

sound/soc/mediatek/mt8192/mt8192-afe-pcm.c

@@ -67,7 +67,7 @@ static int mt8192_irq_fs(struct snd_pcm_substream *substream, unsigned int rate)
 	return mt8192_general_rate_transform(afe->dev, rate);
 }
 
-int mt8192_get_memif_pbuf_size(struct snd_pcm_substream *substream)
+static int mt8192_get_memif_pbuf_size(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 
@@ -2134,7 +2134,7 @@ static int mt8192_afe_component_probe(struct snd_soc_component *component)
 	return mtk_afe_add_sub_dai_control(component);
 }
 
-const struct snd_soc_component_driver mt8192_afe_component = {
+static const struct snd_soc_component_driver mt8192_afe_component = {
 	.name = AFE_PCM_NAME,
 	.probe = mt8192_afe_component_probe,
 	.pointer = mtk_afe_pcm_pointer,

sound/soc/mediatek/mt8192/mt8192-dai-i2s.c

@@ -2037,7 +2037,7 @@ static const struct mtk_afe_i2s_priv mt8192_i2s_priv[DAI_I2S_NUM] = {
 	},
 };
 
-int mt8192_dai_i2s_get_share(struct mtk_base_afe *afe)
+static int mt8192_dai_i2s_get_share(struct mtk_base_afe *afe)
 {
 	struct mt8192_afe_private *afe_priv = afe->platform_priv;
 	const struct device_node *of_node = afe->dev->of_node;
@@ -2057,7 +2057,7 @@ int mt8192_dai_i2s_get_share(struct mtk_base_afe *afe)
 	return 0;
 }
 
-int mt8192_dai_i2s_set_priv(struct mtk_base_afe *afe)
+static int mt8192_dai_i2s_set_priv(struct mtk_base_afe *afe)
 {
 	int i;
 	int ret;