Enable NetworkStackRootTests in presubmit. am: 84062d6a97

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2261946

Change-Id: I5d4ab97a9c52c4676ae3e0c2f501e619cacb9f36
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>