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

Shadow RAM support is apparently not at all working on the Intel 5300 Wifi.

Tested:

* Intel 5300 3x3 wifi
* Intel 5100

Fix the required calibration flags for the Centrino 1000 NIC.

Fix the Intel 6150 support.

This chip doesn't require the temperature sensor offset, either v1 or
v2. Doing so causes the initial calibration test to fail.

Tested:

* Intel Centrino 6150

Add some initial support for the Intel 6235.

Tested:

* Intel 5100
* Intel 6235

Obtained from: mav, others

Add some PLCP thresholds from Linux iwlwifi driver in preparation for
working on some RF tuning issues.

The linux iwlwifi driver has these thresholds which they use to see
if there are PLCP errors over a certain interval. If they hit this,
they trigger a single-channel (different from active channels!)
scan to retune the RF front-end.

Centrino Wireless-N 2200 does not have bluetooth support.

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>