Revert "platform/x86: ideapad-laptop: Switch touchpad attribute to be RO"

The touchpad can be enabled/disabled via this attribute on a Lenovo
Yoga 520-14IKB. Allow writing as it provides legitimate functionality.

This reverts commit 7f363145.
Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210203215403.290792-24-pobrn@protonmail.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/ideapad-laptop.c

@@ -462,10 +462,9 @@ static ssize_t touchpad_show(struct device *dev,
 	return sysfs_emit(buf, "%d\n", !!result);
 }
 
-/* Switch to RO for now: It might be revisited in the future */
-static ssize_t __maybe_unused touchpad_store(struct device *dev,
-					     struct device_attribute *attr,
-					     const char *buf, size_t count)
+static ssize_t touchpad_store(struct device *dev,
+			      struct device_attribute *attr,
+			      const char *buf, size_t count)
 {
 	struct ideapad_private *priv = dev_get_drvdata(dev);
 	bool state;
@@ -481,7 +480,7 @@ static ssize_t __maybe_unused touchpad_store(struct device *dev,
 	return count;
 }
 
-static DEVICE_ATTR_RO(touchpad);
+static DEVICE_ATTR_RW(touchpad);
 
 static ssize_t conservation_mode_show(struct device *dev,
 				struct device_attribute *attr,