[FS#473] ath9k unstable - kernel panic every ~5 minutes

[LEDE Bugs]

The following task has a new comment added:

FS#473 - ath9k unstable - kernel panic every ~5 minutes
User who did this - Mauro Mozzarelli (ezplanet)

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@Dave

I tested on BT Home Hub 5 with single core kernel. It does not crash. 
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=473#comment1739