Merge "Make RtNetlinkLinkMessage class immutable after creation" into main am: e7f5ac9d2f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3266574

Change-Id: I420d02d2edc9ac53d2021e03b76495c04ba69c88
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>