The ath9k update causes frequent panics, to revert it for now.

This reverts commit a889b127.

This significantly improves fastd performance, to the level it was before
Barrier Breaker.

This gets us an up-to-date alfred (and batman-adv 2014.x, as soon as we start to
support it).

The only packages we use from this repo are haveged and (now) fastd and its
dependencies, so we can make the switch safely without updating OpenWrt itself
to Barrier Breaker yet.

This now includes the previously added patch.