Sensor.Value: add path constants

Add path constants that allow code to avoid hard-coding strings.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9e93017572933ffd920dd13c301867b33cbb0203
diff --git a/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml
index 360b888..61db8ec 100644
--- a/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml
@@ -105,3 +105,29 @@
           - monitored_by
       required_endpoint_interfaces:
           - xyz.openbmc_project.Inventory.Item.Bmc
+
+paths:
+    - namespace: /xyz/openbmc_project/sensors
+      segments:
+          - name: Airflow
+            value: airflow
+          - name: Altitude
+            value: altitude
+          - name: Current
+            value: current
+          - name: Energy
+            value: energy
+          - name: FanTach
+            value: fan_tach
+          - name: Humidity
+            value: humidity
+          - name: Power
+            value: power
+          - name: Pressure
+            value: pressure
+          - name: Temperature
+            value: temperature
+          - name: Utilization
+            value: utilization
+          - name: Voltage
+            value: voltage