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

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

Change-Id: I986f59067f382958912735b8a2fd62a62263dc97
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>