sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

bwn(4): Conditionalize "RX decryption attempted" message on a new
BWN_DEBUG_HWCRYPTO debug flag.

The MAC will attempt decryption (and set BWN_RX_MAC_DEC) even if a key has
not been supplied to the hardware; this is expected behavior, and there's
no need to spam users' console with this debugging printf.

[bwn] add opt_wlan.h and opt_bwn.h so we can enable bwn debugging as appropriate.

Tested:

* BCM4322, STA mode (11a)

Sponsored by: Palm Springs

[bwn] add more debugging bits.

I'm hoping to migrate the device_printf() bits out into macros so we can
control it later.

Also, add some new debug sections that I'll soon be using.

[bwn] [bhnd] initial support for using bhnd for if_bwn devices.

This is an initial work in progress to use the replacement bhnd
bus code for devices which support it.

* Add manpage updates for bhnd, bhndb, siba
* Add kernel options for bhnd, bhndbus, etc
* Add initial support in if_bwn_pci / if_bwn_mac for using bhnd
as the bus transport for suppoted NICs
* if_bwn_pci will eventually be the PCI bus glue to interface to bwn,
which will use the right backend bus to attach to, versus direct
nexus/bhnd attachments (as found in embedded broadcom devices.)

The PCI glue defaults to probing at a lower level than the bwn glue,
so bwn should still attach as per normal without a boot time tunable set.

It's also not fully fleshed out - the bwn probe/attach code needs to be
broken out into platform and bus specific things (just like ath, ath_pci,
ath_ahb) before we can shift the driver over to using this.

Tested:

* BCM4311, STA mode
* BCM4312, STA mode

Submitted by: Landon Fuller <landonf@landonf.org>
Differential Revision: https://reviews.freebsd.org/D6191

[bwn] break out the 'g' phy code into a separate source file.

* Break out the 'g' phy code;
* Break out the debugging bits into a separate source file, since
some debugging prints are done in the phy code;
* Make some more chip methods in if_bwn.c public.

This brings the size of if_bwn.c down to 6,805 lines which is now
approaching managable.