K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2013-03-01T04:51:44.128168Z
K 7
svn:log
V 445
Defer the main frame TX through a per-vap task.

The task runs in the ieee80211com task, so vaps are still serialised with
each other as well as the rest of the ic state.

This doesn't serialise the raw xmit path or any of the raw xmit state setup.
It also doesn't touch the other paths (fast frames deferred handling/flush;
ageq and power save handling; mesh TX handling.)  These will come next.

Tested:

* AR5416, STA mode
* AR9280, STA mode

END