[Battlemesh] BSS load element patch

[Arthur LENA]

Hi all!

Attached the patch adding the BSS Load IE to the beacon sent by the
ath9k driver (specification can be found @ IEEE802.11-2012 §8.4.2.30).
It fills the channel utilization field (based on cycles counters read
out of the chipsets) and the station count field. This patch applies
successfully to the compat-wireless package in the OpenWRT build
environment (trunk r45674) and was tested on the WDR4300. All comments
are welcome!!



Cheers
Arthur
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