scsi: lpfc: Set PU field when providing D_ID in XMIT_ELS_RSP64_CX iocb

When providing a D_ID in XMIT_ELS_RSP64_CX iocb the PU field should
be set to 3 to describe the parameter being passed to firmware.

Link: https://lore.kernel.org/r/20220701211425.2708-4-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>