Input: st-keyscan - switch to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr()

SIMPLE_DEV_PM_OPS() is deprecated as it requires explicit protection
against unused function warnings.  The new combination of pm_sleep_ptr()
and DEFINE_SIMPLE_DEV_PM_OPS() allows the compiler to see the functions,
thus suppressing the warning, but still allowing the unused code to be
removed. Thus also drop the ifdef guards.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20221204180841.2211588-24-jic23@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/st-keyscan.c

@@ -212,7 +212,6 @@ static int keyscan_probe(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int keyscan_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -247,9 +246,9 @@ static int keyscan_resume(struct device *dev)
 	mutex_unlock(&input->mutex);
 	return retval;
 }
-#endif
 
-static SIMPLE_DEV_PM_OPS(keyscan_dev_pm_ops, keyscan_suspend, keyscan_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(keyscan_dev_pm_ops,
+				keyscan_suspend, keyscan_resume);
 
 static const struct of_device_id keyscan_of_match[] = {
 	{ .compatible = "st,sti-keyscan" },
@@ -261,7 +260,7 @@ static struct platform_driver keyscan_device_driver = {
 	.probe		= keyscan_probe,
 	.driver		= {
 		.name	= "st-keyscan",
-		.pm	= &keyscan_dev_pm_ops,
+		.pm	= pm_sleep_ptr(&keyscan_dev_pm_ops),
 		.of_match_table = of_match_ptr(keyscan_of_match),
 	}
 };