pldm: Implement Cable interface

Adding support to host Cable dbus interface.
Based on the PDRs received from remote PLDM terminus,
PLDM hosts the dbus interface based on the entity type.
The Cable i

pldm: Implement Cable interface

Adding support to host Cable dbus interface.
Based on the PDRs received from remote PLDM terminus,
PLDM hosts the dbus interface based on the entity type.
The Cable interface is defined at [1].

[1]: https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/yaml/xyz/openbmc_project/Inventory/Item/Cable.interface.yaml

Change-Id: I23f02387c1d50ce8d9c5921760740760cea2cd47
Signed-off-by: Archana Kakani <archana.kakani@ibm.com>

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