iio:accel:kxsd9: Switch from CONFIG_PM guards to pm_ptr() etc

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM support is simpler and less error prone than the
use of #ifdef based config guards.

Removing instances of this approach from IIO also stops them being
copied into new drivers.

Signed-off-by: Jonathan Cameron <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Link: https://lore.kernel.org/r/[e-mail]

drivers/iio/accel/kxsd9-i2c.c

···
 	.driver = {
 		.name	= "kxsd9",
 		.of_match_table = kxsd9_of_match,
-		.pm = &kxsd9_dev_pm_ops,
+		.pm = pm_ptr(&kxsd9_dev_pm_ops),
 	},
 	.probe		= kxsd9_i2c_probe,
 	.remove		= kxsd9_i2c_remove,

drivers/iio/accel/kxsd9-spi.c

···
 static struct spi_driver kxsd9_spi_driver = {
 	.driver = {
 		.name = "kxsd9",
-		.pm = &kxsd9_dev_pm_ops,
+		.pm = pm_ptr(&kxsd9_dev_pm_ops),
 		.of_match_table = kxsd9_of_match,
 	},
 	.probe = kxsd9_spi_probe,

drivers/iio/accel/kxsd9.c

···
 }
 EXPORT_SYMBOL_NS(kxsd9_common_remove, IIO_KXSD9);
 
-#ifdef CONFIG_PM
 static int kxsd9_runtime_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
···
 
 	return kxsd9_power_up(st);
 }
-#endif /* CONFIG_PM */
 
-const struct dev_pm_ops kxsd9_dev_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
-				pm_runtime_force_resume)
-	SET_RUNTIME_PM_OPS(kxsd9_runtime_suspend,
-			   kxsd9_runtime_resume, NULL)
-};
-EXPORT_SYMBOL_NS(kxsd9_dev_pm_ops, IIO_KXSD9);
+EXPORT_NS_RUNTIME_DEV_PM_OPS(kxsd9_dev_pm_ops, kxsd9_runtime_suspend,
+			     kxsd9_runtime_resume, NULL, IIO_KXSD9);
 
 MODULE_AUTHOR("Jonathan Cameron <[e-mail]>");
 MODULE_DESCRIPTION("Kionix KXSD9 driver");