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

[bwn] convert another PHY-N workaround to the freebsd bwn format.

These were hidden behind an #ifdef that we weren't setting.

I don't have the hardware in question to check.

[bwn] disable rfon checks so the 2056/2057 radios are programmed.

This was the big missing piece for getting the BCM94322MC NIC
to work at all.

Tested:

* BCM4322, STA mode (2g, 5g)

[bwn] improve N-PHY debuggability a little bit.

[bwn] add opt_wlan.h and opt_bwn.h to each of the phy_n source files.

[bwn] add initial bwn(4) N-PHY code, ported from Linux b43.

This is a GPLv2 PHY-N implementation based on the Linux b43 driver,
ported over to work in bwn(4).

I've tested this on the BCM4321 11abgn device, in 11bg and 11a modes.
The b43 PHY code only supports 11abg, no 11n, and 20MHz only wide
channels.

Yes, this is a GPLv2 driver, so it won't be included in the
default builds.

Tested:

* BCM4321 11abgn device (Apple!), 11bg and 11a STA mode.

Obtained from: Linux b43