Add hostside CTS tests for SoftApConfig redaction

Add hostside CTS tests to test for SoftApConfiguration being redacted
from TetheringInterface for apps that don't own that config.

Bug: 216524590
Test: atest CtsHostsideNetworkTests
Change-Id: I823c8e94cc6fe10c6118e7a694da368e585bbd69
diff --git a/tests/cts/hostside/app2/AndroidManifest.xml b/tests/cts/hostside/app2/AndroidManifest.xml
index 412b307..6ccaf4f 100644
--- a/tests/cts/hostside/app2/AndroidManifest.xml
+++ b/tests/cts/hostside/app2/AndroidManifest.xml
@@ -42,6 +42,8 @@
             android:debuggable="true">
         <service android:name=".RemoteSocketFactoryService"
              android:exported="true"/>
+        <service android:name=".TetheringHelperService"
+             android:exported="true"/>
     </application>
 
     <!--