[FS#368] issues with airtime fairness on the ath9k

[LEDE Bugs]

The following task has a new comment added:

FS#368 - issues with airtime fairness on the ath9k
User who did this - Felix Fietkau (nbd)

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According to reports from some people, the issues with ATF are gone in latest versions (with ATF re-applied).
I will push ATF to master again soon.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=368#comment1390