Merge "clatd: embed struct tun_pi directly in buf" am: 43de18bce9

Original change: https://android-review.googlesource.com/c/platform/external/android-clat/+/2485977

Change-Id: I29cfb72dd77116eee050bc9db11ab1f4e5b5116e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>