Input: touchscreen - use __maybe_unused instead of ifdef around suspend/resume

Use __maybe_unused instead of ifdef guards around suspend/resume
functions, in order to increase build coverage and fix build warnings.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
index 7ccaa1b..32f8ac0 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c
@@ -242,8 +242,7 @@
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int wacom_i2c_suspend(struct device *dev)
+static int __maybe_unused wacom_i2c_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 
@@ -252,7 +251,7 @@
 	return 0;
 }
 
-static int wacom_i2c_resume(struct device *dev)
+static int __maybe_unused wacom_i2c_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 
@@ -260,7 +259,6 @@
 
 	return 0;
 }
-#endif
 
 static SIMPLE_DEV_PM_OPS(wacom_i2c_pm, wacom_i2c_suspend, wacom_i2c_resume);