Input: ilitek_ts_i2c - 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>
Cc: Joe Hung <joe_hung@ilitek.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230102181842.718010-49-jic23@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/ilitek_ts_i2c.c

@@ -604,7 +604,7 @@ static int ilitek_ts_i2c_probe(struct i2c_client *client)
 	return 0;
 }
 
-static int __maybe_unused ilitek_suspend(struct device *dev)
+static int ilitek_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct ilitek_ts_data *ts = i2c_get_clientdata(client);
@@ -621,7 +621,7 @@ static int __maybe_unused ilitek_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused ilitek_resume(struct device *dev)
+static int ilitek_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct ilitek_ts_data *ts = i2c_get_clientdata(client);
@@ -640,7 +640,7 @@ static int __maybe_unused ilitek_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(ilitek_pm_ops, ilitek_suspend, ilitek_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(ilitek_pm_ops, ilitek_suspend, ilitek_resume);
 
 static const struct i2c_device_id ilitek_ts_i2c_id[] = {
 	{ ILITEK_TS_NAME, 0 },
@@ -675,7 +675,7 @@ MODULE_DEVICE_TABLE(of, ilitek_ts_i2c_match);
 static struct i2c_driver ilitek_ts_i2c_driver = {
 	.driver = {
 		.name = ILITEK_TS_NAME,
-		.pm = &ilitek_pm_ops,
+		.pm = pm_sleep_ptr(&ilitek_pm_ops),
 		.of_match_table = of_match_ptr(ilitek_ts_i2c_match),
 		.acpi_match_table = ACPI_PTR(ilitekts_acpi_id),
 	},