scsi: snic: fix a couple of spelling mistakes/typos

Trivial fix to spelling mistakes/typos:

"requrest_irq" -> "request_irq"
"Firmwqre" -> "Firmware"

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