Add PrivacySettings to System category.

This activity is only activated when useDefaultBackup flag is set in
SettingsActivity

Bug: 31801428
Test: RunSettingsRoboTests
Change-Id: I7f5e968684dea623fb5604f944472accb89a0176

src/com/android/settings/SettingsActivity.java

@@ -1189,6 +1189,10 @@ public class SettingsActivity extends SettingsDrawerActivity
         boolean useDefaultBackup = TextUtils.isEmpty(backupIntent);
         setTileEnabled(new ComponentName(packageName,
                 Settings.PrivacySettingsActivity.class.getName()), useDefaultBackup, isAdmin, pm);
+        setTileEnabled(new ComponentName(packageName,
+                        "com.android.settings.PrivacyDashboardAlias"),
+                useDefaultBackup, isAdmin, pm);
+
         boolean hasBackupActivity = false;
         if (!useDefaultBackup) {
             try {