OpenBSD / src / iOoS4Lc / Remove some unused code left over from an ancient (i.e. 2007) attempt

OpenBSD/src iOoS4Lc — sys/dev/ata atascsi.c atascsi.h

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   Remove some unused code left over from an ancient (i.e. 2007) attempt
   to present wd disks as sd drives.

   ok deraadt@