Clean up the USB driver directories, remove unbuilt source.

Remove old source that has not (yet) been ported. If any of these
drivers would get ported in the future, it would be from current
FreeBSD

Clean up the USB driver directories, remove unbuilt source.

Remove old source that has not (yet) been ported. If any of these
drivers would get ported in the future, it would be from current
FreeBSD source anyway. Keeping the old source around just confuses
when grepping in /usr/src.

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Various tiny updates in wlan*.4 manual pages and other related areas.

kernel: Remove (unhooked) acx(4), bwi(4), iwl(4) and rtw(4).

The first three were written by sephe and rtw(4) was ported from NetBSD
by him. They were all never ported to the newer wlan(4) upgrades

kernel: Remove (unhooked) acx(4), bwi(4), iwl(4) and rtw(4).

The first three were written by sephe and rtw(4) was ported from NetBSD
by him. They were all never ported to the newer wlan(4) upgrades we got,
starting with Rui Paulo's back in 2010.

Approved-by: sephe

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bwn: Porting from FreeBSD

* Adding bwn and siba_bwn to sys/conf/files and to the X86_64_GENERIC kernel
configuration.

* Replacing BWN_LOCK, BWN_UNLOCK, BWN_ASSERT_SERIALIZED with
wlan_global_se

bwn: Porting from FreeBSD

* Adding bwn and siba_bwn to sys/conf/files and to the X86_64_GENERIC kernel
configuration.

* Replacing BWN_LOCK, BWN_UNLOCK, BWN_ASSERT_SERIALIZED with
wlan_global_serializer.

* Increasing some alignments from 4K to 8K and some from 1 byte to 4 bytes.

* Changing slot counts for RX and TX from 64 to 256, which is the same size
as used by b43 in Linux.

* Allow overriding the BWN_TXRING_SLOTS and BWN_RXRING_SLOTS values in the
kernel configuration.

* Some style fixes. Removing unneeded NULL checks.

* Replace a DELAY(50000) with tsleep.

* Can't use kmalloc to allocate memory for dma like in FreeBSD and Linux.

* A few typo and grammar fixes in the bwn.4 manpage.

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kernel/usb4bsd: Port rum(4).

The driver behaves mostly stable but a few issues remain, such as
kldunloading cleanly.

iwn(4): Hook the manual pages into the build as well.

Uncomment some references to wpi(4) now that it is in.

Sync the wlan*(4) manual pages with FreeBSD for the 802.11 update.