ASoC: fsl: constify static snd_soc_dai_ops structs

The only usage of these is to assign their address to the 'ops' field in
the snd_soc_dai_driver struct, which is a pointer to const. Make them
const to allow the compiler to put them in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20210206225849.51071-1-rikard.falkeborn@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_easrc.c

@@ -1530,7 +1530,7 @@ static int fsl_easrc_hw_free(struct snd_pcm_substream *substream,
 	return 0;
 }
 
-static struct snd_soc_dai_ops fsl_easrc_dai_ops = {
+static const struct snd_soc_dai_ops fsl_easrc_dai_ops = {
 	.startup = fsl_easrc_startup,
 	.trigger = fsl_easrc_trigger,
 	.hw_params = fsl_easrc_hw_params,

sound/soc/fsl/fsl_micfil.c

@@ -381,7 +381,7 @@ static int fsl_micfil_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
 	return ret;
 }
 
-static struct snd_soc_dai_ops fsl_micfil_dai_ops = {
+static const struct snd_soc_dai_ops fsl_micfil_dai_ops = {
 	.startup = fsl_micfil_startup,
 	.trigger = fsl_micfil_trigger,
 	.hw_params = fsl_micfil_hw_params,

sound/soc/fsl/fsl_xcvr.c

@@ -857,7 +857,7 @@ static struct snd_kcontrol_new fsl_xcvr_tx_ctls[] = {
 	},
 };
 
-static struct snd_soc_dai_ops fsl_xcvr_dai_ops = {
+static const struct snd_soc_dai_ops fsl_xcvr_dai_ops = {
 	.prepare = fsl_xcvr_prepare,
 	.startup = fsl_xcvr_startup,
 	.shutdown = fsl_xcvr_shutdown,