scsi: mptfc: fix spelling mistake in macro names

Rename macros MPI_FCPORTPAGE0_SUPPORT_SPEED_UKNOWN and
MPI_FCPORTPAGE0_CURRENT_SPEED_UKNOWN to add in missing N in UNKNOWN

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>