Adds flowstats changes

These changes are based on flowstats changes in shortcut-fe

Tests:
1. Verified that connection stats are present in /proc/net/ip_conn_addr
   when enabled on R920 kernel and R920 running firmware with these changes.
   Also verified that counters increase when routed traffic is passed
   between WAN and LAN
2. Verified that latency measured to 3 sites (www.cnn.com,
   www.oxford.co.uk, www.ufl.edu) via ping, is the same as measured in
   proc file ip_conn_addr

Change-Id: Ibf087a5ca80727e0e4617a9afde78d271f1a55ff
7 files changed