Added MANAGE_GAME_MODE permission to CTS

Test: atest PermissionPolicyTest
Bug: b/178111358
Change-Id: I49d8ea7e5810bcc90eb372ce52ff699d8717b469
diff --git a/tests/tests/permission2/res/raw/android_manifest.xml b/tests/tests/permission2/res/raw/android_manifest.xml
index 31763d7..fe8d59e 100644
--- a/tests/tests/permission2/res/raw/android_manifest.xml
+++ b/tests/tests/permission2/res/raw/android_manifest.xml
@@ -5408,6 +5408,11 @@
     <permission android:name="android.permission.MANAGE_TOAST_RATE_LIMITING"
                 android:protectionLevel="signature" />
 
+    <!-- Allows managing the Game Mode
+     @hide Used internally. -->
+    <permission android:name="android.permission.MANAGE_GAME_MODE"
+                android:protectionLevel="signature" />
+
     <!-- Attribution for Geofencing service. -->
     <attribution android:tag="GeofencingService" android:label="@string/geofencing_service"/>
     <!-- Attribution for Country Detector. -->