randomized clat dad nonce, send only one copy am: a1cb0f30de am: 5149c20556

Original change: https://android-review.googlesource.com/c/platform/external/android-clat/+/2161296

Change-Id: Iff070b31ac4f1a0e08ec36c2836ca3cd9db5644f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>