rainier: Add a virtual ambient temp sensor

Use the virtual-sensor application to put a virtual ambient temperature
sensor on D-Bus.  Currently, it just mirrors the value of the TMP275
ambient temperature sensor, but in the future the output will be based
on all three temp sensors on the panel after the remaining two show up
on D-Bus.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I4bbae2735d3ca5832e71a0b258cdd202446e3f95
diff --git a/recipes-phosphor/sensors/phosphor-virtual-sensor/rainier/virtual_sensor_config.json b/recipes-phosphor/sensors/phosphor-virtual-sensor/rainier/virtual_sensor_config.json
new file mode 100644
index 0000000..6458836
--- /dev/null
+++ b/recipes-phosphor/sensors/phosphor-virtual-sensor/rainier/virtual_sensor_config.json
@@ -0,0 +1,24 @@
+[
+    {
+        "Desc":
+        {
+            "Name": "Ambient_Virtual_Temp",
+            "SensorType": "temperature"
+        },
+        "Params":
+        {
+            "DbusParam":
+            [
+                {
+                    "ParamName": "T0",
+                    "Desc":
+                    {
+                        "Name": "Ambient_0_Temp",
+                        "SensorType": "temperature"
+                    }
+                }
+            ]
+        },
+        "Expression": "T0"
+    }
+]