Defines starting with `n' in osfmk/i386/AT386

• NDRIVERS osfmk/i386/AT386/kernBootStruct.h:35
• NO_SETALRM osfmk/i386/AT386/bbclock_entries.h:31
• NUM_EISA_SLOTS osfmk/i386/AT386/kernBootStruct.h:100