scsi: mpt3sas: Fix an issue when driver is being removed

Warnings may be logged during driver removal:

mpt3sas 0000:01:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT ..,

Fix this by deallocating DMA memory later.

Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Link: https://lore.kernel.org/r/20230403184736.6399-1-thenzl@redhat.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>