scsi: 53c700: Fix spelling of 'NEGOTIATION'

'NEGOTIATION' was misspelled as 'NEGOTATION'. Fixed it. It is a coding
style change which should have no impact on runtime execution of code.

Signed-off-by: Faisal Mehmood <f.m3hm00d@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>