Fix Association interface

Mapper changed to only allow the new interface, update
to it.

Tested: Mapper showed all associations

Change-Id: I8b252c70e9f27b083a438393c731fbeb3e2ca0e5
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/src/MCUTempSensor.cpp b/src/MCUTempSensor.cpp
index 0b621d0..bf6c2c6 100644
--- a/src/MCUTempSensor.cpp
+++ b/src/MCUTempSensor.cpp
@@ -78,7 +78,7 @@
     }
     association = objectServer.add_interface(
         "/xyz/openbmc_project/sensors/temperature/" + name,
-        "org.openbmc.Associations");
+        association::interface);
 }
 
 MCUTempSensor::~MCUTempSensor()