ASoC: amd: acp3x: Make acp3x_dai_i2s_ops static

Fix sparse warning:

sound/soc/amd/raven/acp3x-pcm-dma.c:561:24: warning:
 symbol 'acp3x_dai_i2s_ops' was not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/raven/acp3x-pcm-dma.c

@@ -558,7 +558,7 @@ static int acp3x_dai_i2s_trigger(struct snd_pcm_substream *substream,
 	return ret;
 }
 
-struct snd_soc_dai_ops acp3x_dai_i2s_ops = {
+static struct snd_soc_dai_ops acp3x_dai_i2s_ops = {
 	.hw_params = acp3x_dai_i2s_hwparams,
 	.trigger   = acp3x_dai_i2s_trigger,
 	.set_fmt = acp3x_dai_i2s_set_fmt,