Fix up the link quality lookup and re-enable multi-rate retry.

This is a terrible solution that at least behaves mostly correctly.

It walks the currently active rate table looking for rates to match.
It assumes that the code matches the setup path in the link quality
setup code (much like the previous, much simpler but even more hackish
math did.)

It's O(n), but n<15, so we're okay for the time being.

Tested:

* Intel 5100, STA - 11a, 11n, 11bg modes.
Commit over some work to prepare the iwn(4) driver for further chipset
support.

* Extend the hardware base_params structure to include a bunch of hardware
  flags indicating what is and isn't supported.

* Convert a bunch of the initial hardware configuration conditionals to
  consult the base_params structure.

* Add new calibration code for temperature calibration for the Centrino 2xxx
  series NICs.

* Add new bluetooth coexistence code for Centrino 2xxx series NICs.

* For NICs that support PAN (personal area networking), use a different
  transmit queue and command queue setup, in preparation for said
  PAN support.

* Extend the calibration array in iwn_softc to include enough space for
  the new calibration types.

Tested (by myself, if not mentioned):

* Intel 4965
* Intel 5100
* Intel 6150
* Intel 2230
* Intel 2200 (eadler)
* Intel 1030
* Intel 6200
* Intel 6230
* Intel 6250
* Intel 6150
* Intel 100

What doesn't work:

* Intel 6235 - fails in calibration at startup

TODO:

* Testing on Intel 53xx series hardware

Submitted by:	Cedric Gross <cg@cgross.info>
Add IDs for the ASIX 88179 and 88178A USB to GigE adapters.