scsi: lpfc: Fix MDS Diagnostic Enablement definition

The MDS diagnostic enablement bit for the adapter interface is incorrect in
the driver header.

Correct the bit position for the SET_FEATURE MDS bit.

Link: https://lore.kernel.org/r/20200501214310.91713-9-jsmart2021@gmail.com


Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>