scsi: mpt3sas: Fix spelling mistake in Kconfig "compatiblity" -> "compatibility"

There is a spelling mistake in the Kconfig help text. Fix it.

Link: https://lore.kernel.org/r/20201217172019.57768-1-colin.king@canonical.com


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