irqchip/renesas-irqc: Convert to DEFINE_SIMPLE_DEV_PM_OPS()

Convert the Renesas IRQC driver from SIMPLE_DEV_PM_OPS() to
DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr().  This allows to drop the
__maybe_unused annotations from its suspend callback, and reduces kernel
size in case CONFIG_PM or CONFIG_PM_SLEEP is disabled.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/5a14f9932da20ec46cde27f314414474072755ed.1752086718.git.geert+renesas@glider.be

Author: geertu

drivers/irqchip/irq-renesas-irqc.c

@@ -227,7 +227,7 @@ static void irqc_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 }
 
-static int __maybe_unused irqc_suspend(struct device *dev)
+static int irqc_suspend(struct device *dev)
 {
 	struct irqc_priv *p = dev_get_drvdata(dev);
 
@@ -237,7 +237,7 @@ static int __maybe_unused irqc_suspend(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(irqc_pm_ops, irqc_suspend, NULL);
+static DEFINE_SIMPLE_DEV_PM_OPS(irqc_pm_ops, irqc_suspend, NULL);
 
 static const struct of_device_id irqc_dt_ids[] = {
 	{ .compatible = "renesas,irqc", },
@@ -251,7 +251,7 @@ static struct platform_driver irqc_device_driver = {
 	.driver		= {
 		.name		= "renesas_irqc",
 		.of_match_table	= irqc_dt_ids,
-		.pm		= &irqc_pm_ops,
+		.pm		= pm_sleep_ptr(&irqc_pm_ops),
 	}
 };