Add SetPointOffset To Refish

This allows adding a threshold as a setpoint offset
so that dynamic thresholds can be used to modify a
setpoint.

Tested: Get and Patch worked

{
    "Oem": {
        "OpenBmc": {
            "Fan": {
                "PidControllers": {
                    "CPU1_DIMM_ABC": {
                        "SetPointOffset": "UpperThresholdCritical"
                    }
                }
            }
        }
    }
}

Change-Id: If515971778a8041aba0ab51da87ec5b29ebc359d
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/static/redfish/v1/JsonSchemas/OemManager/index.json b/static/redfish/v1/JsonSchemas/OemManager/index.json
index 5cc0b83..107621e 100644
--- a/static/redfish/v1/JsonSchemas/OemManager/index.json
+++ b/static/redfish/v1/JsonSchemas/OemManager/index.json
@@ -408,6 +408,11 @@
                     "longDescription": "Setpoint for the PID.",
                     "type": "number"
                 },
+                "SetPointOffset": {
+                    "description": "Threshold to take value from and apply to setpoint.",
+                    "longDescription": "Threshold to take value from and apply to setpoint. Valid threshold names are supported.",
+                    "type": "string"
+                },
                 "SlewNeg": {
                     "description": "Negative slew rate for the PID.",
                     "longDescription": "Negative slew rate for the PID.",
@@ -578,4 +583,4 @@
         }
     },
     "title": "#OemManager"
-}
\ No newline at end of file
+}