DO NOT MERGE: use legacy way to get tcp packet count

DO NOT MERGE: use legacy way to get tcp packet count

The current networkStats getIfaceStats implementation check if
bpf is enabled, and use bpf to get all traffic stats. However,
the bpf implementation did not contain tcp packet counts. So
data stall detection in DcTracker could not get the packet
count to trigger data stall. Hence the data stall never
triggers for device that enables bpf.

This solution is for short term solution that rollback the
design to use xt_qtaguid for bpf enabled device.

Bug: 110443385
Test: 1. fake data stall to trigger data stall recovery
      2. enable debug log to make sure tcp packet count is
         correct
      3. runtest frameworks-net
      4. run cts -m CtsUsageStatsTestCases

Change-Id: I1ce9e92fe194da2ea0a3eec014fd50bb50cdd44a