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/FileEncryptionPreferenceController.java

@@ -23,15 +23,14 @@ import android.os.SystemProperties;
 import android.os.storage.IStorageManager;
 import android.support.annotation.VisibleForTesting;
 import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceScreen;
 import android.text.TextUtils;
 
 import com.android.settings.R;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settingslib.development.DeveloperOptionsPreferenceController;
 
-public class FileEncryptionPreferenceController extends
-        DeveloperOptionsPreferenceController implements PreferenceControllerMixin {
+public class FileEncryptionPreferenceController extends DeveloperOptionsPreferenceController
+        implements PreferenceControllerMixin {
 
     private static final String KEY_CONVERT_FBE = "convert_to_file_encryption";
     private static final String KEY_STORAGE_MANAGER = "mount";
@@ -41,8 +40,6 @@ public class FileEncryptionPreferenceController extends
 
     private final IStorageManager mStorageManager;
 
-    private Preference mPreference;
-
     public FileEncryptionPreferenceController(Context context) {
         super(context);
 
@@ -67,13 +64,6 @@ public class FileEncryptionPreferenceController extends
         return KEY_CONVERT_FBE;
     }
 
-    @Override
-    public void displayPreference(PreferenceScreen screen) {
-        super.displayPreference(screen);
-
-        mPreference = screen.findPreference(getPreferenceKey());
-    }
-
     @Override
     public void updateState(Preference preference) {
         if (!TextUtils.equals("file",