ASoC: au1x: psc-i2s: constify dev_pm_ops structure

This dev_pm_ops structure is only stored in the pm field of a
device_driver structure. This field is declared const, so
dev_pm_ops structures that have this property can be declared
as const also.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/au1x/psc-i2s.c

@@ -392,7 +392,7 @@ static int au1xpsc_i2s_drvresume(struct device *dev)
 	return 0;
 }
 
-static struct dev_pm_ops au1xpsci2s_pmops = {
+static const struct dev_pm_ops au1xpsci2s_pmops = {
 	.suspend	= au1xpsc_i2s_drvsuspend,
 	.resume		= au1xpsc_i2s_drvresume,
 };