scsi: smartpqi: Update OFA management

OFA, Online Firmware Activation, allows users to update firmware without a
reboot.

 - Change OFA setup to a worker thread

 - Delay soft resets

 - Add OFA event handler to allow FW to initiate OFA

 - Add in-memory allocation to OFA events

 - Update OFA buffer size calculations

 - Add ability to cancel OFA events

 - Update OFA quiesce/un-quiesce

 - Prevent Kernel crashes while issuing ioctl during OFA

 - Returned EBUSY for pass-through IOCTLs throughout all stages of OFA

 - Add mutex to prevent parallel OFA updates.

Link: https://lore.kernel.org/r/161549381563.25025.2647205502550052197.stgit@brunhilda


Reviewed-by: Scott Benesh <scott.benesh@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>