netkit: Add tstats per-CPU traffic counters

Add dev->tstats traffic accounting to netkit. The latter contains per-CPU
RX and TX counters.

The dev's TX counters are bumped upon pass/unspec as well as redirect
verdicts, in other words, on everything except for drops.

The dev's RX counters are bumped upon successful __netif_rx(), as well
as from skb_do_redirect() (not part of this commit here).

Using dev->lstats with having just a single packets/bytes counter and
inferring one another's RX counters from the peer dev's lstats is not
possible given skb_do_redirect() can also bump the device's stats.

Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Nikolay Aleksandrov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin KaFai Lau <[email protected]>

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