Input: mpr121-touchkey - 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>
Link: https://lore.kernel.org/r/20221204180841.2211588-9-jic23@kernel.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/mpr121_touchkey.c

@@ -340,7 +340,7 @@ static int mpr_touchkey_probe(struct i2c_client *client)
 	return 0;
 }
 
-static int __maybe_unused mpr_suspend(struct device *dev)
+static int mpr_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 
@@ -352,7 +352,7 @@ static int __maybe_unused mpr_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused mpr_resume(struct device *dev)
+static int mpr_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct mpr121_touchkey *mpr121 = i2c_get_clientdata(client);
@@ -366,7 +366,7 @@ static int __maybe_unused mpr_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(mpr121_touchkey_pm_ops, mpr_suspend, mpr_resume);
 
 static const struct i2c_device_id mpr121_id[] = {
 	{ "mpr121_touchkey", 0 },
@@ -385,7 +385,7 @@ MODULE_DEVICE_TABLE(of, mpr121_touchkey_dt_match_table);
 static struct i2c_driver mpr_touchkey_driver = {
 	.driver = {
 		.name	= "mpr121",
-		.pm	= &mpr121_touchkey_pm_ops,
+		.pm	= pm_sleep_ptr(&mpr121_touchkey_pm_ops),
 		.of_match_table = of_match_ptr(mpr121_touchkey_dt_match_table),
 	},
 	.id_table	= mpr121_id,