iio:accel:da280: Switch from CONFIG_PM_SLEEP guards to pm_sleep_ptr() etc

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP 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 <Jonathan.Cameron@huawei.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220130193147.279148-3-jic23@kernel.org

drivers/iio/accel/da280.c

@@ -153,7 +153,6 @@ static int da280_probe(struct i2c_client *client,
 	return devm_iio_device_register(&client->dev, indio_dev);
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int da280_suspend(struct device *dev)
 {
 	return da280_enable(to_i2c_client(dev), false);
@@ -163,9 +162,8 @@ static int da280_resume(struct device *dev)
 {
 	return da280_enable(to_i2c_client(dev), true);
 }
-#endif
 
-static SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);
 
 static const struct acpi_device_id da280_acpi_match[] = {
 	{"MIRAACC", da280},
@@ -184,7 +182,7 @@ static struct i2c_driver da280_driver = {
 	.driver = {
 		.name = "da280",
 		.acpi_match_table = ACPI_PTR(da280_acpi_match),
-		.pm = &da280_pm_ops,
+		.pm = pm_sleep_ptr(&da280_pm_ops),
 	},
 	.probe		= da280_probe,
 	.id_table	= da280_i2c_id,