scsi: smartpqi: remove timeout for cache flush operations

scsi: smartpqi: remove timeout for cache flush operations

Orabug: 25144431

Some cache flush operations can take longer than the timeout value. Best
to not impose a time limit to handle all cases.

Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit d48f8fad1e435eff26c29e8e109c1a50c441e533)
Signed-off-by: Brian Maly <brian.maly@oracle.com>