scsi: lpfc: Validate ELS LS_ACC completion payload

A WCQE success completion status does not guarantee valid LS_ACC receipt
for ELS commands.  So, introduce a small helper routine that validates ELS
LS_ACC frames in ELS cmpl routines.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20231009161812.97232-5-justintee8345@gmail.com


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