[bwn] implement firmware tx/rx versioning and fix RSSI calculation.

Different versions of firmware have different requirments for TX/RX
packet layouts (and other things, of course.)  Currently the driver
checks between 3xx and 4xx firmware by using the BWN_ISOLDFMT() macro,
which doesn't take into account the 5xx firmware (which I think I need
for the HT and N series PHY chips.  I'll know when I do the port.)
BWN_HDRSIZE() also needs to learn about the 5xx series firmware
as well.

So:

* add a firmware version enum
* populate it based on the firmware version we read at load time
* don't finish loading if the firmware is the 5xx firmware; any
  code using BWN_ISOLDFMT or BWN_HDRSIZE needs updating (most notably
  the TX and RX bits.)

Then, for RX RSSI:

* write down and reimplement the b43 rssi calculation method;
* use it for the correct PHYs (which are all the ones we support);
* do the RSSI calculation before radiotap, not after.

Tested:

* Broadcom BCM4312, STA mode

Obtained from:	Linux b43 (careful writing and reimplementing; lots of integer math..)

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