Defines starting with `n' in arch/i386/netboot

• NBPG arch/i386/netboot/main.c:198
• __nbtypes_h_ arch/i386/netboot/nbtypes.h:52
• NE_BASEREG arch/i386/netboot/ne2100.c:27
• NE_DMACHANNEL arch/i386/netboot/ne2100.c:28
• NRCVRING arch/i386/netboot/ne2100.c:44
• NRETRIES arch/i386/netboot/param.h:19
• NUM arch/i386/netboot/kbd.c:77