Remove isAtLeastR checks am: d0302b917e

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/3264750

Change-Id: I19b0962664d65edb12442904131a319d9efac218
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>