wlan - Sync dev/netif/ath from FreeBSD part 5/N

* Adjustments relative to previous commit to compile ath on DragonFly.

* Tested with chromebook.

wlan - Sync dev/netif/ath from FreeBSD part 4/N

* Sync dev/netif/ath from FreeBSD, fbsd git dd885b9a0a0e, May 11 2016.
(freebase + our Makefiles, does not include dfly adjustments).

kernel/ath - Synchronize with FreeBSD

* Synchronize ath with FreeBSD.

wlan/atheros - Synchronize sleep state code from FreeBSD

* Synchronize Adrian Chadd's sleep state code and wlan updates.

* With this commit if the wlan or ath interface is in a 'down' state,
it w

wlan/atheros - Synchronize sleep state code from FreeBSD

* Synchronize Adrian Chadd's sleep state code and wlan updates.

* With this commit if the wlan or ath interface is in a 'down' state,
it will use full sleep mode and save power.

* We get all of ATH through today but the 802_11 changes are a bit
too substantial so this commit only brings in the sleep state code
through today (3-May-2014).

* There is a bunch of other 802_11 work that needs to be brought in
but it's like 20,000 lines of patches so... not today.

* Verified operational on Acer C720 chromebook. full-sleep mode saves
0.3-0.4W. Network sleep mode code is also verified to be operational
but does not appear to save any power at the moment.

Also verified: beacons are working properly for wakeups on packet
reception.

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ath - Reimport fresh from FreeBSD 01-Jan-2014 for re-port

* Bring the FreeBSD files in verbatim for the atheros driver. Create
a sub-directory "ath", move if_ath* and ah_* into ath/

* as-of (fbs

ath - Reimport fresh from FreeBSD 01-Jan-2014 for re-port

* Bring the FreeBSD files in verbatim for the atheros driver. Create
a sub-directory "ath", move if_ath* and ah_* into ath/

* as-of (fbsd) git commitid 843c1c95adbb59b90772ccb36241906ccf1923ed

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