Remove unnecessary onDeveloperOptionsSwitchEnabled/Disabled override.

- default implementation has been added in the super class to handle
enabling/disabling the preference when the master developer options
switch it turned on/off. Removing all subclass that originally
implemented the methods that only contains the default behavior.

Bug: 73955632
Test: make RunSettingsRoboTests
Change-Id: I13c372c2ab498a5786b40cdc1ad3b5f3424abb5a

src/com/android/settings/development/MemoryUsagePreferenceController.java

@@ -34,7 +34,6 @@ public class MemoryUsagePreferenceController extends DeveloperOptionsPreferenceC
 
     private static final String MEMORY_USAGE_KEY = "memory";
 
-    private Preference mPreference;
     private ProcStatsData mProcStatsData;
 
     public MemoryUsagePreferenceController(Context context) {
@@ -50,7 +49,6 @@ public class MemoryUsagePreferenceController extends DeveloperOptionsPreferenceC
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
 
-        mPreference = screen.findPreference(getPreferenceKey());
         mProcStatsData = getProcStatsData();
         setDuration();
     }