ASoC: cs48l32: Use modern PM_OPS

When building for a platform that does not support CONFIG_PM, such as
s390, cs48l32_runtime_{suspend,resume}() are unused because
SET_RUNTIME_PM_OPS does not reference its argument when CONFIG_PM is not
set:

  sound/soc/codecs/cs48l32.c:3822:12: error: 'cs48l32_runtime_suspend' defined but not used [-Werror=unused-function]
   3822 | static int cs48l32_runtime_suspend(struct device *dev)
        |            ^~~~~~~~~~~~~~~~~~~~~~~
  sound/soc/codecs/cs48l32.c:3779:12: error: 'cs48l32_runtime_resume' defined but not used [-Werror=unused-function]
   3779 | static int cs48l32_runtime_resume(struct device *dev)
        |            ^~~~~~~~~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors

Use RUNTIME_PM_OPS and pm_ptr() to ensure these functions are seen as
used by the compiler but be dropped in the final object file when
CONFIG_PM is not set, matching the current behavior while clearing up
the warnings.

Fixes: e2bcbf9 ("ASoC: cs48l32: Add driver for Cirrus Logic CS48L32 audio DSP")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20250418-cs48l32-modern-pm_ops-v1-1-640559407619@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: nathanchance

sound/soc/codecs/cs48l32.c

@@ -3834,7 +3834,7 @@ static int cs48l32_runtime_suspend(struct device *dev)
 }
 
 static const struct dev_pm_ops cs48l32_pm_ops = {
-	SET_RUNTIME_PM_OPS(cs48l32_runtime_suspend, cs48l32_runtime_resume, NULL)
+	RUNTIME_PM_OPS(cs48l32_runtime_suspend, cs48l32_runtime_resume, NULL)
 };
 
 static int cs48l32_configure_clk32k(struct cs48l32 *cs48l32)
@@ -4057,7 +4057,7 @@ MODULE_DEVICE_TABLE(spi, cs48l32_spi_ids);
 static struct spi_driver cs48l32_spi_driver = {
 	.driver = {
 		.name		= "cs48l32",
-		.pm		= &cs48l32_pm_ops,
+		.pm		= pm_ptr(&cs48l32_pm_ops),
 		.of_match_table	= cs48l32_of_match,
 	},
 	.probe		= &cs48l32_spi_probe,