ASoC: SOF: imx8ulp: Constify snd_sof_dsp_ops

'struct snd_sof_dsp_ops' is not modified by core code, so it can be made
const for increased code safety.
Tested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240426-n-const-ops-var-v2-10-e553fe67ae82@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/imx/imx8ulp.c

@@ -408,7 +408,7 @@ static int imx8ulp_dsp_set_power_state(struct snd_sof_dev *sdev,
 }
 
 /* i.MX8 ops */
-static struct snd_sof_dsp_ops sof_imx8ulp_ops = {
+static const struct snd_sof_dsp_ops sof_imx8ulp_ops = {
 	/* probe and remove */
 	.probe		= imx8ulp_probe,
 	.remove		= imx8ulp_remove,