scsi: bnx2fc: Update the driver version to 2.12.13

Update version to 2.12.13.

Link: https://lore.kernel.org/r/20200327054849.15947-4-skashyap@marvell.com


Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>