MFC r335785, r335812

r335785 by eadler:
iwn: Correct Centrino Advanced-N 6235 constants

The iwn 6235 is a 2x2 device (see
https://ark.intel.com/products/66890/Intel-Centrino-Advanced-N-6235-Dual-Band)

r335812 by eadler:
iwn: Add the missing IWN_SDID_6035_5 subdevice

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add support for the Intel Centrino Wireless-N 105 chipset.

MFC after: 2 weeks
Relnotes: yes

Add support for the Intel Centrino Wireless-N 135 chipset.

MFC after: 2 weeks

Add device ids for the Centrino 2x00 devices.

Submitted by: Cedric Gross <cg@cgross.info>

Break out the iwn(4) device IDs into if_iwn_devid.h, as well as add
IDs for new devices.

* Add new device IDs
* Extend the ID probe code to include the newer range of bits used
by later model devices

Tested:

* Intel 5100, STA mode

TODO:

* Test on Intel 4965, just to be sure

Submitted by: Cedric GROSS <cg@gross.info>