scsi: smartpqi: Synchronize device resets with mutex

scsi: smartpqi: Synchronize device resets with mutex

Remove some flags used to check for device resets already in
progress. Allow only 1 reset operation at a time for the host.

Link: https://lore.kernel.org/r/161549379810.25025.10194117431886743795.stgit@brunhilda
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>