1. Make sure that the TX and RX descriptor rings are 4096 byte aligned.

    Also use BUS_DMA_ALLOCNOW to be on the safe side.

2.  Look for the Descriptor Error, and Descriptor Protocol Error flags from
    the card, and down the interface if we detect either.

#1 (along with fixes to busdma) makes sure that this card works in all
memory situations.  Prior to this change, it was just luck that 512 count
RX/TX lists were properly aligned.  Now we can use any size of RX/TX lists
and still have them properly aligned.

#2 ensures that we don't get into an endless interrupt storm if busdma fails
us.  Descriptor Protocol Error would occur if we misaligned the TX/RX rings,
and Descriptor Error would occur if we tried to give the card descriptors
or rings with addresses > 1G.  Trying to reinitialize the card isn't going
to fix these errors, hence we don't try.

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