scsi: fc: Add EDC ELS definition

Add Exchange Diagnostic Capabilities (EDC) ELS definition and the following
capability descriptors:

 - Link Fault Capability Descriptor

 - Congestion Signaling Capability Descriptor

Definitions taken from FC-LS-5 r5.01

Link: https://lore.kernel.org/r/20210816162901.121235-2-jsmart2021@gmail.com


Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>