serial: sh-sci: Convert to DEFINE_SIMPLE_DEV_PM_OPS()

Convert the Renesas SuperH SCI(F) serial port driver from
SIMPLE_DEV_PM_OPS() to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr().
This lets us drop the __maybe_unused annotations from its suspend and
resume callbacks, and reduces kernel size in case CONFIG_PM or
CONFIG_PM_SLEEP is disabled.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/a5628fe028362ae3f8729021a7864dd39f7869bf.1752086885.git.geert+renesas@glider.be
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: geertu

drivers/tty/serial/sh-sci.c

@@ -3754,7 +3754,7 @@ static int sci_probe(struct platform_device *dev)
 	return 0;
 }
 
-static __maybe_unused int sci_suspend(struct device *dev)
+static int sci_suspend(struct device *dev)
 {
 	struct sci_port *sport = dev_get_drvdata(dev);
 
@@ -3772,7 +3772,7 @@ static __maybe_unused int sci_suspend(struct device *dev)
 	return 0;
 }
 
-static __maybe_unused int sci_resume(struct device *dev)
+static int sci_resume(struct device *dev)
 {
 	struct sci_port *sport = dev_get_drvdata(dev);
 
@@ -3793,14 +3793,14 @@ static __maybe_unused int sci_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(sci_dev_pm_ops, sci_suspend, sci_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(sci_dev_pm_ops, sci_suspend, sci_resume);
 
 static struct platform_driver sci_driver = {
 	.probe		= sci_probe,
 	.remove		= sci_remove,
 	.driver		= {
 		.name	= "sh-sci",
-		.pm	= &sci_dev_pm_ops,
+		.pm	= pm_sleep_ptr(&sci_dev_pm_ops),
 		.of_match_table = of_match_ptr(of_sci_match),
 	},
 };