Run NetworkStatsManagerTest on R+ devices. am: e8d0004996 am: e76cf82879

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

Change-Id: Ie924b199483ba10347e38da86a4e051d5ac3a54f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>