Grant notif permission to test

As it sends notifications

Test: com.android.cts.net.HostsideRestrictBackgroundNetworkTests#testDozeModeMetered_enabledButWhitelistedOnNotificationAction
Fixes: 218219438
Change-Id: Ib79c5f250cabc92d454ffb828e82d528eadb2774
diff --git a/tests/cts/hostside/app2/AndroidManifest.xml b/tests/cts/hostside/app2/AndroidManifest.xml
index 6c9b469..ff7240d 100644
--- a/tests/cts/hostside/app2/AndroidManifest.xml
+++ b/tests/cts/hostside/app2/AndroidManifest.xml
@@ -22,6 +22,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 
     <!--
      This application is used to listen to RESTRICT_BACKGROUND_CHANGED intents and store