Set threadnetwork apex as non-updatable. am: 952d37b995 am: 1ddaca34bc

Original change: https://android-review.googlesource.com/c/platform/packages/modules/ThreadNetwork/+/3156296

Change-Id: I46805d8ccddba396458ac6a2891e092c748a15f6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>