scsi: smartpqi: Update documentation

Change Microsemi references to Microchip.

Link: https://lore.kernel.org/r/159864895592.13630.18113151805817361168.stgit@brunhilda


Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>