WiFi: 11n hostap mode added to athn(4) driver, testers wanted

OpenBSD as WiFi access points look set to be making a comeback in the near future.

With this diff https://marc.info/?l=openbsd-tech&m=148396652007923&w=2, Stefan Sperling added 802.11n hostap mode, with full support initially for the Atheros chips supported by the athn(4) driver.

This diff adds 11n support to the athn(4) driver.
Requires -current net80211 code from today.

Tested in hostap mode and client mode with:

athn0 at pci1 dev 0 function 0 "Atheros AR9281" rev 0x01: apic 2 int 16athn0: AR9280 rev 2 (2T2R), ROM rev 22, adddress xx:xx:xx:xx:xx:xx

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