[FS#59] ath9k: Switch to using mac80211 intermediate software queues causes unstable connections

[LEDE Bugs]

The following task is now closed:

FS#59 - ath9k: Switch to using mac80211 intermediate software queues causes unstable connections
User who did this - Felix Fietkau (nbd)

Reason for closing: Fixed
More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=59