Add SupportDashboardActivity to secondary user home AI

Secondary users could not see the support preference in the
settings home screen because it was missing from the list of
whitelisted activities. This CL adds the SupportDashboardActivity
to the list so that secondary users can see it.

Test: Robotests still pass for SettingsGateway
Change-Id: Ia48dbd5b8d396c1bdf050c102fee0a5cd5300ed2

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -25,6 +25,7 @@ import com.android.settings.DateTimeSettings;
 import com.android.settings.DeviceAdminSettings;
 import com.android.settings.DeviceInfoSettings;
 import com.android.settings.DisplaySettings;
+import com.android.settings.dashboard.SupportDashboardActivity;
 import com.android.settings.dream.DreamSettings;
 import com.android.settings.IccLockSettings;
 import com.android.settings.MasterClear;
@@ -262,6 +263,7 @@ public class SettingsGateway {
             Settings.SecuritySettingsActivity.class.getName(),
             Settings.AccessibilitySettingsActivity.class.getName(),
             Settings.SystemDashboardActivity.class.getName(),
+            SupportDashboardActivity.class.getName(),
             // Home page > Network & Internet
             Settings.WifiSettingsActivity.class.getName(),
             Settings.DataUsageSummaryActivity.class.getName(),

src/com/android/settings/dashboard/SupportDashboardActivity.java

@@ -27,8 +27,6 @@ import com.android.settings.overlay.SupportFeatureProvider;
  */
 public class SupportDashboardActivity extends Activity {
 
-    public SupportDashboardActivity() {}
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);