CFT: macio attachment for if_wi

[Justin Hibbits]

Attached is a patch adding the macio attachment for the if_wi driver,  
to support the airport card in PowerPC macs.  To do this I needed to  
modify the wi_read_bap and wi_write_bap functions to use the bus space  
stream functions instead of regular functions, like NetBSD and OpenBSD  
do.  I currently get a 'no carrier' status from ifconfig, so I can't  
fully test connections, only the attachment.  Testing wanted and  
needed to make sure I didn't break anything.

- Justin
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