Another chunk of bus_dma fixes. May actually approach correctness now.

1) Actually map and sync scatter gather list that is also DMA'd.

2) Actually map and sync request sense buffer.

3) Actually POSTREAD/WRITE sync data buffer after I/O, rather than
skipping it because the I/O was successful and no chars were left to
xfer.

4) Eliminate extra fields, clarify some names, reorder fields to
clarify their use.

5) Put common scatter gather preparation logic into separate function.

6) If insertion of request sense command fails, complete active
command with XS_SENSE, but zero'd sense data.

7) Eliminate physical address arithmetic as much as possible,
centralizing remaining manipulations in code actually sending
addresses to adapter.

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