1. use the "Location.PartLocation.ServiceLabel == NCSI" to identify N…

…CSI cable;

2. use "UpstreamChassis" to identify the local device;
3. use "DownstreamChassis" to identify the remote device.

PiperOrigin-RevId: 491474831

ecclesia/lib/redfish/property_definitions.h

@@ -99,6 +99,8 @@ inline constexpr char kRfPropertyNvmeSmartCriticalWarnings[] =
     "NVMeSMARTCriticalWarnings";
 inline constexpr char kRfPropertyLinks[] = "Links";
 inline constexpr char kRfPropertyContainedBy[] = "ContainedBy";
+inline constexpr char kRfPropertyDownstreamChassis[] = "DownstreamChassis";
+inline constexpr char kRfPropertyUpstreamChassis[] = "UpstreamChassis";
 inline constexpr char kRfPropertyOriginOfCondition[] = "OriginOfCondition";
 inline constexpr char kRfPropertyPcieDevice[] = "PCIeDevice";
 inline constexpr char kRfPropertyPcieDevices[] = "PCIeDevices";