Merge "NetworkStats: Avoid Division By 0" am: e22278838e am: 538771303d am: 6dd8eab0f0 am: a997289c51

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1810678

Change-Id: I145d64d66627f80298b830d61e30dc99bd4297fc