Remove dividers of TopIntroPreference

- Following UX request to remove dividers of TopIntro.

Bug: 182854896
Change-Id: I601e87e8f20e25fde3197674f9503ab9dff292a0
Test: manual

packages/SettingsLib/TopIntroPreference/src/com/android/settingslib/widget/TopIntroPreference.java

@@ -39,11 +39,4 @@ public class TopIntroPreference extends Preference {
         setLayoutResource(R.layout.top_intro_preference);
         setSelectable(false);
     }
-
-    @Override
-    public void onBindViewHolder(PreferenceViewHolder holder) {
-        super.onBindViewHolder(holder);
-        holder.setDividerAllowedAbove(true);
-        holder.setDividerAllowedBelow(true);
-    }
 }