Break out the legacy duration and protection code into routines,

call these after rate control selection is done.

The duration/protection code wasn't working - it expected the rix to
be valid.  Unfortunately after I moved the rate control selection into
late in the process, the rix value isn't valid and thus the protection/
duration code would get things wrong.

HT frames are now correctly protected with an RTS and for the AR5416,
this involves having the aggregate frames be limited to 8K.

TODO:

* Fix up the DMA sync to occur just before the frame is queued to the
  hardware.  I'm adjusting the duration here but not doing the DMA
  flush.

* Doubly/triply ensure that the aggregate frames are being limited to
  the correct size, or the AR5416 will get unhappy when TXing RTS-protected
  aggregates.

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