Almost complete rewrite of iwn(4).

Add support for Intel WiFi Link 5000 Series adapters (5100/5150/5300/5350).

Quite frankly, Intel made things unnecessarily difficult by gratuitously
changing firmware commands (adding new fields in the middle of a struct)
and some register offsets for the 5000 Series and by defining yet another
way of loading a firmware.
I had to write a hardware abstraction layer to manage those differences.

Committed over a 5300 adapter (3T3R).
Require an upgrade of the iwn-firmware package, even for 4965AGN users.
Not tested on 5100, 5150 and 5350 (test reports are more than welcomed.)
There should be no regression on the 4965AGN.

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