Merge "BpfNetworkStats: pass lines vector by reference in 2 more functions" am: 95c49cb9b8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2541492

Change-Id: Ibe9444c7b6fcea590f282703207ffb636dc3c287
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>