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)

Add a new flag - HAL_DEBUG_UNMASKABLE - which always logs a debug message
(when debug is enabled) no matter what.

Some BB hang changes:

* Add Howl (ar9130) to the list of chips that have DFS/BB/MAC hangs
* Don't treat unknown BB hangs as fatal; ath9k/Atheros HAL don't
treat it as such.
* Add HAL_DEBUG_DFS to the debug fields in ath_hal/ah_debug.h

The BB hang check simply loops over an observation register checking
for a stuck state engine, but it can happen under high traffic
conditions. Ath9k and the Atheros HAL simply log a debug message and
continue.

Private to FreeBSD:

* Add HAL_DEBUG_HANG to the debug fields
* Change the hang debugging to HAL_DEBUG_HANG rather than HAL_DEBUG_DFS
like in the Atheros HAL.

Obtained from: Atheros

More kite diversity related changes.

* add a diversity flag to the HAL debugging section
* add a check to make sure the kite diversity code doesn't run
on boards that don't require it, as not all Kite chips will
implement it.
* add some debug statements when the diversity code makes
changes to the antenna diversity/combining setup.

* fix HAL_DEBUG_INTERRUPT to be a separate bit, it was overlapping with
something else
* add HAL_DEBUG_GPIO, for some GPIO related debugging I'm tinkering with
at the moment.

Replace Id keyword with FreeBSD keyword and set the svn props correctly.
No functional change.

add FreeBSD property

import ath hal

virgin import of ath hal