scsi: smartpqi: Fix RAID map race condition

Correct a rare stale RAID map access when performing AIO during a RAID
configuration change.

A race condition in the driver could cause it to access a stale RAID map
when a logical volume is reconfigured.

Modify the driver logic to invalidate a RAID map very early when a RAID
configuration change is detected and only switch to a new RAID map after
the driver detects that the RAID map has changed.

Link: https://lore.kernel.org/r/165730606128.177165.7671413443814750829.stgit@brunhilda
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@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>