Sensors: Add additional namespaces

Add the current, power and energy namespaces.

Change-Id: I0c8d54e8b0910534dab77faedb25ae9cd1339102
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
index 84bf8fa..f8ef993 100644
--- a/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
+++ b/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
@@ -6,6 +6,10 @@
       fan_tach
       voltage
       altitude
+      current
+      power
+      energy
+
 
     Additionally, any object implementing Sensor.Threshold.Warning must also
     implement Sensor.Value.