Add MTE Settings.

MTE is a technology to help prevent exploitation of some security bugs.
We want to offer users that want to trade off a slight reduction in
performance for higher security the option to do so from the settings
menu.

Test: make RunSettingsRoboTests
      check UI manually
Bug: 245624194
Change-Id: Ifbb76e124142ae843ce90bd604ae8417d65fcc7b

tests/robotests/src/com/android/settings/testutils/shadow/ShadowStorageManager.java

@@ -16,6 +16,7 @@
 
 package com.android.settings.testutils.shadow;
 
+import android.annotation.NonNull;
 import android.os.storage.DiskInfo;
 import android.os.storage.StorageManager;
 import android.os.storage.VolumeInfo;
@@ -25,6 +26,9 @@ import org.robolectric.annotation.Implementation;
 import org.robolectric.annotation.Implements;
 import org.robolectric.annotation.Resetter;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Implements(StorageManager.class)
 public class ShadowStorageManager {
 
@@ -40,6 +44,10 @@ public class ShadowStorageManager {
         return sIsForgetCalled;
     }
 
+    public @NonNull List<VolumeInfo> getVolumes() {
+        return new ArrayList<VolumeInfo>();
+    }
+
     @Resetter
     public static void reset() {
         sIsUnmountCalled = false;