scsi: mpt3sas: Fix spelling mistake

Fix typo: "tigger" --> "trigger"

Link: https://lore.kernel.org/r/20200609161313.32098-1-f.suligoi@asem.it
Signed-off-by: Flavio Suligoi <f.suligoi@asem.it>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>