scsi: smartpqi: Improve accuracy/performance of raid-bypass-counter

The original implementation of this counter used an atomic variable.
However, this implementation negatively impacted performance in some
configurations.

Switch to using per_cpu variables.

Reviewed-by: Scott Benesh <[email protected]>
Reviewed-by: Scott Teel <[email protected]>
Reviewed-by: Mike McGowen <[email protected]>
Co-developed-by: Mahesh Rajashekhara <[email protected]>
Signed-off-by: Mahesh Rajashekhara <[email protected]>
Signed-off-by: Kevin Barnett <[email protected]>
Signed-off-by: Don Brace <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

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