[ath_hal] add extra debugging for MCI interrupts.

store the AR9300 interrupts away when doing interrupt debugging.

Bring over my FreeBSD modifications for the AR9300 HAL to make it
work in FreeBSD.

This is still heavily a work in progress but I'd rather it start
shipping in -HEAD sooner rather than later.

This

Bring over my FreeBSD modifications for the AR9300 HAL to make it
work in FreeBSD.

This is still heavily a work in progress but I'd rather it start
shipping in -HEAD sooner rather than later.

This doesn't (yet) link it into the build system either for a static
kernel or as a module; that will come later (after many, many make universe
tests.)

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Copy the vendor branch ar9300 code from qcamain_open_hal into this
directory.

Only copy the ar9300 HAL, we don't want to grab everything.