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/schema/OemManager_v1.xml b/static/redfish/v1/schema/OemManager_v1.xml
index 164f272..9ae36ca 100644
--- a/static/redfish/v1/schema/OemManager_v1.xml
+++ b/static/redfish/v1/schema/OemManager_v1.xml
@@ -245,6 +245,10 @@
                     <Annotation Term="OData.Description" String="Setpoint for the PID." />
                     <Annotation Term="OData.LongDescription" String="Setpoint for the PID." />
                 </Property>
+                <Property Name="SetPointOffset" Type="Edm.String" Nullable="false">
+                    <Annotation Term="OData.Description" String="Threshold to take value from and apply to setpoint." />
+                    <Annotation Term="OData.LongDescription" String="Threshold to take value from and apply to setpoint. Valid threshold names are supported." />
+                </Property>
                 <Property Name="SlewNeg" Type="Edm.Decimal" Nullable="false">
                     <Annotation Term="OData.Description" String="Negative slew rate for the PID." />
                     <Annotation Term="OData.LongDescription" String="Negative slew rate for the PID." />