Convert the asr driver to use the bus_space API.  This does not represent a significant functional change, but it further cleans up the code and brings it closer to being portable.  Thanks to Don Bowman for helping to test this.
Convert the asr driver to use the bus_space API.  This does not represent
a significant functional change, but it further cleans up the code and
brings it closer to being portable.  Thanks to Don Bowman for helping to
test this.

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