Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Bring in Andrew Thompson's port of Sepherosa Ziehau's bwi driver for
Broadcom BCM43xx chipsets. This driver uses the v3 firmware that
needs to be fetched separately. A port will be committed to create
the bwi firmware module.

The driver matches the following chips: Broadcom BCM4301, BCM4307,
BCM4306, BCM4309, BCM4311, BCM4312, BCM4318, BCM4319

The driver works for 802.11b and 802.11g.

Limitations:
This doesn't support the 802.11a or 802.11n portion of radios.
Some BCM4306 and BCM4309 cards don't work with Channel 1, 2 or 3.
Documenation for this firmware is reverse engineered from
http://bcm.sipsolutions.net/
V4 of the firmware is needed for 11a or 11n support
http://bcm-v4.sipsolutions.net/
Firmware needs to be fetched from a third party, port to be committed

# I've tested this with a BCM4319 mini-pci and a BCM4318 CardBus card, and
# not connected it to the build until the firmware port is committed.

Obtained from: DragonFlyBSD, //depot/projects/vap
Reviewed by: sam@, thompsa@