Run NetworkStatsManagerTest on R+ devices. am: e8d0004996

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2098093

Change-Id: Ib873b91e6ce8ba6647e04bf22ce4d5a87391a683
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>