This is a fairly minimal fix for aacraid. It removes the happy cast
pointers to u32 garbage in the 2.6 code and replaces it with the working
2.4 equivalents. I've not backported any of the other changes from 2.4 to
2.6 yet, and some things have gone which are good to be gone (eg the
proc/scsi horror). There is a certain amount of white space noise caused
by realigning with the 2.4 code so I could see what was going on.

Tested on a dual opteron