mac80211: remove TX latency measurement code
Revert commit ad38bfc9 ("mac80211: Tx frame latency statistics") (along with some follow-up fixes). This code turned out not to be as useful in the current form as we thought, and we've internally hacked it up more, but that's not very suitable for upstream (for now), and we might just do that with tracing instead. Therefore, for now at least, remove this code. We might also need to use the skb->tstamp field for the TCP performance issue, which is more important than the debugging. Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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