[BR03.1] Expose isUidNetworkingBlocked

Test: atest CtsHostsideNetworkTests:com.android.cts.net.HostsideNetworkCallbackTests
Bug: 297836825
Change-Id: I70b2351b9cd1c3c6fa34258397e0bf22cb8150b2
diff --git a/common/flags.aconfig b/common/flags.aconfig
index 7235202..0c46b48 100644
--- a/common/flags.aconfig
+++ b/common/flags.aconfig
@@ -27,3 +27,10 @@
   description: "Set data saver through ConnectivityManager API"
   bug: "297836825"
 }
+
+flag {
+  name: "support_is_uid_networking_blocked"
+  namespace: "android_core_networking"
+  description: "This flag controls whether isUidNetworkingBlocked is supported"
+  bug: "297836825"
+}