scsi: scsi_transport_fc: fix typos on 64/128 GBit define names

The define names specified 64Bit/128Bit, not 64GBIT/128GBIT.  Correct
the names.

Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>