Defines starting with `b' in iokit/Drivers/scsi/drvSymbios8xx

• BBCK iokit/Drivers/scsi/drvSymbios8xx/Sym8xxRegs.h:289
• BF iokit/Drivers/scsi/drvSymbios8xx/Sym8xxRegs.h:174
• BL2 iokit/Drivers/scsi/drvSymbios8xx/Sym8xxRegs.h:293
• BO89 iokit/Drivers/scsi/drvSymbios8xx/Sym8xxRegs.h:294