Add some debugging and comments about what's going on when reinitialising

the FIFO.

I still see some corner cases where no RX occurs when it should be
occuring.  It's quite possible that there's a subtle race condition
somewhere; or maybe I'm not programming the RX queues right.

There's also no locking here yet, so any reset/configuration path
state change (ie, enabling/disabling receive from the ioctl, net80211
taskqueue, etc) could quite possibly confuse things.

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