pinctrl: samsung: mark PM functions as __maybe_unused

The rework of the suspend/resume handling uses the wrong #ifdef check, leading
to a build warning without CONFIG_PM_SLEEP:

drivers/pinctrl/samsung/pinctrl-samsung.c:1142:12: error: 'samsung_pinctrl_resume' defined but not used [-Werror=unused-function]
drivers/pinctrl/samsung/pinctrl-samsung.c:1092:12: error: 'samsung_pinctrl_suspend' defined but not used [-Werror=unused-function]

Using a __maybe_unused annotation instead of the #ifdef is a simple way to
avoid this problem class.

Fixes: 2b24efa8e5 ("pinctrl: samsung: Replace syscore ops with standard platform device pm_ops")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/samsung/pinctrl-samsung.c

@@ -1083,13 +1083,12 @@ static int samsung_pinctrl_probe(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
 /**
  * samsung_pinctrl_suspend - save pinctrl state for suspend
  *
  * Save data for all banks handled by this device.
  */
-static int samsung_pinctrl_suspend(struct device *dev)
+static int __maybe_unused samsung_pinctrl_suspend(struct device *dev)
 {
 	struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
 	int i;
@@ -1139,7 +1138,7 @@ static int samsung_pinctrl_suspend(struct device *dev)
  * We don't bother doing anything complicated to avoid glitching lines since
  * we're called before pad retention is turned off.
  */
-static int samsung_pinctrl_resume(struct device *dev)
+static int __maybe_unused samsung_pinctrl_resume(struct device *dev)
 {
 	struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
 	int i;
@@ -1183,7 +1182,6 @@ static int samsung_pinctrl_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static const struct of_device_id samsung_pinctrl_dt_match[] = {
 #ifdef CONFIG_PINCTRL_EXYNOS