BpfNetworkStats: implement bpfRegisterIface() and wire it up

Test: TreeHugger
  atest libnetworkstats_test
  a_test --iterations=100 NetworkStackIntegrationTests:android.net.NetworkStatsIntegrationTest
Bug: 292156770
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I3b1038f6fb306ed8f2d20a73d2f7c36593cbd739
3 files changed