Changes to substitute u64 with atomic64_t

Updates:
In the review for e33abd5947e9d02d3717b928c22267d64342c9cb it was
suggested to use atomic types for packet and byte counts.

Tests:
Flashed firmware with above changes to R920. Verified that
accelerated flows are counted correctly in debugfs

Change-Id: Ia38a9701bd4cd9d981af1957fc0f090a9bd3dd29
4 files changed