ASoC: amd: acp6x-pdm-dma: Constify static snd_soc_dai_ops

The only usage of acp6x_pdm_dai_ops is to assign its address to the ops
field in the snd_soc_dai_driver struct, which is a pointer to const
snd_soc_dai_ops. Make it const to allow the compiler to put it in
read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20211204110848.21322-1-rikard.falkeborn@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/yc/acp6x-pdm-dma.c

@@ -318,7 +318,7 @@ static int acp6x_pdm_dai_trigger(struct snd_pcm_substream *substream,
 	return ret;
 }
 
-static struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
+static const struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
 	.trigger   = acp6x_pdm_dai_trigger,
 };