Add feature flag for REGISTER_NSD_OFFLOAD_ENGINE permission

Bug: 304478692
Test: TH
Change-Id: Ib7234b2e3b5c725bde0db9b93ac96d745a65f57d
diff --git a/common/flags.aconfig b/common/flags.aconfig
index b85c2fe..ebfa13a 100644
--- a/common/flags.aconfig
+++ b/common/flags.aconfig
@@ -41,3 +41,10 @@
   description: "Block network access for apps in a low importance background state"
   bug: "304347838"
 }
+
+flag {
+  name: "register_nsd_offload_engine"
+  namespace: "android_core_networking"
+  description: "The flag controls the access for registerOffloadEngine API in NsdManager"
+  bug: "294777050"
+}