* Although the hardware is awake, the power state handling doesn't think so.
So just explicitly wake it up early in setup so ath_hal calls don't complain.
* We shouldn't be transmitting or ACKing frames during DFS CAC or on passive
channels before we hear a beacon. So, start laying down comments in the
places where this work has to be done.
Note:
* The main bit missing from finishing this particular bit of work is a state
call to transition a VAP from passive to non-passive when a beacon is heard.
CAC is easy, it's an interface state. So, I'll go and add a method to control
that soon.
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