ath - Basic re-port, base code compile

ath - Basic re-port, base code compile

* First re-port pass, make base code modifications to work with DragonFly.

* Remove ath locks (mostly using #define's).

* Protect entry points with our global wlan_serializer.  This includes:
	- callout functions
	- PCI entry/exit
	- ifnet access (typically already protected from the DFly kernel).
	- taskqueue functions
	- sysctl functions

* Rework the sysctl hierarchy a little.

* Fixup malloc->kmalloc, free->kfree, snprintf->ksnprintf.
* Fixup ether_sprintf() use cases.

* Fixup bad M_NOWAIT semantics from FreeBSD.  Convert all such to
  M_INTWAIT.

* IFF_RUNNING and IFF_OACTIVE adjustments.

* Temporarily #if 0 out code that our wlan infrastructure does not
  yet support.

* Add appropriate DRIVER and MODULE declarations for module handling.

* #include path adjustments

* API differences in bus_dma_tag_create(), bus_dmamap_load_mbuf_sg(),
  and related interactions.

* Several TAILQ_FOREACH_SAFE() interactions were broken (pushed to Adrian).

* Revert field name for now (tap->txa_tid -> tap_txa_ac).  We need to fixup
  our wlan infrastructure to rename txa_ac to txa_tid.

* va_list/va_start/va_end -> __va_list/__va_start/__va_end.