Input: mtk-pmic-keys - 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 __maybe_unused markings.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20221204180841.2211588-10-jic23@kernel.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/mtk-pmic-keys.c

@@ -231,7 +231,7 @@ static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
 	return 0;
 }
 
-static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev)
+static int mtk_pmic_keys_suspend(struct device *dev)
 {
 	struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 	int index;
@@ -247,7 +247,7 @@ static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused mtk_pmic_keys_resume(struct device *dev)
+static int mtk_pmic_keys_resume(struct device *dev)
 {
 	struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 	int index;
@@ -263,8 +263,8 @@ static int __maybe_unused mtk_pmic_keys_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
-			mtk_pmic_keys_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
+				mtk_pmic_keys_resume);
 
 static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = {
 	{
@@ -387,7 +387,7 @@ static struct platform_driver pmic_keys_pdrv = {
 	.driver = {
 		   .name = "mtk-pmic-keys",
 		   .of_match_table = of_mtk_pmic_keys_match_tbl,
-		   .pm = &mtk_pmic_keys_pm_ops,
+		   .pm = pm_sleep_ptr(&mtk_pmic_keys_pm_ops),
 	},
 };