Add flag for IPv6 over BLE

Bug: 372936361
Test: TH
Change-Id: Idde296c9cbcb64721fda9d9bdd06884306cfb3a1
diff --git a/common/flags.aconfig b/common/flags.aconfig
index 17ef94b..60a827b 100644
--- a/common/flags.aconfig
+++ b/common/flags.aconfig
@@ -156,3 +156,12 @@
   bug: "354619988"
   is_fixed_read_only: true
 }
+
+flag {
+  name: "ipv6_over_ble"
+  is_exported: true
+  namespace: "android_core_networking"
+  description: "API flag for IPv6 over BLE"
+  bug: "372936361"
+  is_fixed_read_only: true
+}