Break out most of the HAL related tweaks into a per-HAL instance,

Break out most of the HAL related tweaks into a per-HAL instance,
rather than global variables.

This specifically allows for debugging to be enabled per-NIC, rather
than globally.

Since the ath driver doesn't know about AH_DEBUG, and to keep the ABI
consistent regardless of whether AH_DEBUG is enabled or not, enable the
debug parameter always but only conditionally compile in the debug
methods if needed.

The ALQ support is currently still global pending some brainstorming.

Submitted by:	ssgriffonuser@gmail.com
Reviewed by:	adrian, bschmidt