ASoC: rt5616: add static qualifier for file local symbols

Sparse reports below warnings.

rt5616.c:1270:24: warning: symbol 'rt5616_aif_dai_ops' was not declared. Should it be static?
rt5616.c:1277:27: warning: symbol 'rt5616_dai' was not declared. Should it be static?

These two symbols are just used inner the file, thus it's better to add
static qualifier.

This commit adds it.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5616.c

@@ -1267,14 +1267,14 @@ static int rt5616_resume(struct snd_soc_codec *codec)
 #define RT5616_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
 			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S8)
 
-struct snd_soc_dai_ops rt5616_aif_dai_ops = {
+static struct snd_soc_dai_ops rt5616_aif_dai_ops = {
 	.hw_params = rt5616_hw_params,
 	.set_fmt = rt5616_set_dai_fmt,
 	.set_sysclk = rt5616_set_dai_sysclk,
 	.set_pll = rt5616_set_dai_pll,
 };
 
-struct snd_soc_dai_driver rt5616_dai[] = {
+static struct snd_soc_dai_driver rt5616_dai[] = {
 	{
 		.name = "rt5616-aif1",
 		.id = RT5616_AIF1,