configs: Remove PowerSupplyDeratingSensor

The PowerSupplyDerating Sensor is being added to the ipmi
sensor.yaml file since the /org/openbmc/sensors path is
being deprecated. Remove this sensor from the config.

Tested: Powered on a Witherspoon to the Host OS without
sensor errors.

Change-Id: I08ca374b131c1ca62f632f4a5ae1475b7090bcfe
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/configs/Witherspoon.py b/configs/Witherspoon.py
index 34db072..75c8188 100644
--- a/configs/Witherspoon.py
+++ b/configs/Witherspoon.py
@@ -301,7 +301,6 @@
 # The sensor id is the same as those defined in ID_LOOKUP['SENSOR'].
 MISC_SENSORS = {
     # Garrison value is used, Not in P9 XML yet.
-    0xD8 : { 'class' : 'PowerSupplyDeratingSensor' },
 }
 
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