Input: imagis - 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 <[e-mail]>
Cc: Markuss Broks <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/touchscreen/imagis.c

···
 	return 0;
 }
 
-static int __maybe_unused imagis_suspend(struct device *dev)
+static int imagis_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct imagis_ts *ts = i2c_get_clientdata(client);
···
 	return retval;
 }
 
-static int __maybe_unused imagis_resume(struct device *dev)
+static int imagis_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct imagis_ts *ts = i2c_get_clientdata(client);
···
 	return retval;
 }
 
-static SIMPLE_DEV_PM_OPS(imagis_pm_ops, imagis_suspend, imagis_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(imagis_pm_ops, imagis_suspend, imagis_resume);
 
 #ifdef CONFIG_OF
 static const struct of_device_id imagis_of_match[] = {
···
 static struct i2c_driver imagis_ts_driver = {
 	.driver = {
 		.name = "imagis-touchscreen",
-		.pm = &imagis_pm_ops,
+		.pm = pm_sleep_ptr(&imagis_pm_ops),
 		.of_match_table = of_match_ptr(imagis_of_match),
 	},
 	.probe_new = imagis_probe,