LinuxKPI: 802.11: updates to headers for driver update

Move some structs into the appropriate header to be visible.
Add new fields to structs and enums.

Remove arguments from two functions (one function currently unused
by drivers in the tree, for the other the argument was unused).
Adjust the iwlwifi accordingly. This is in preparation for new
driver versions to allow a smooth transition.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days