Revert "Reduce CPU cycle on calling  TrafficStats for Rx and Tx bytes"

This reverts commit 1733c5c69de78f5c6fb0955105b8f69d1a9022c2.

Reason for revert: com.android.server.wifi.WifiScoreCardTest.testLinkBandwidthTwoRadioStatsVariousTxTraffic failed.

Change-Id: I52d33d1b885018d46ce4230b5177fa22e9b3de66
8 files changed