Move dbus connection into base sensor object

This seems common through most sensors, might as
well move it for consistency.

Tested: sensors operational as normal

Change-Id: I4e6c55cbb7171ee51700015f8c2ef8c05c90fb4e
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/src/MCUTempSensor.cpp b/src/MCUTempSensor.cpp
index 69a3226..6d94bd2 100644
--- a/src/MCUTempSensor.cpp
+++ b/src/MCUTempSensor.cpp
@@ -63,9 +63,9 @@
     Sensor(boost::replace_all_copy(sensorName, " ", "_"),
            std::move(thresholdData), sensorConfiguration,
            "xyz.openbmc_project.Configuration.ExitAirTemp", mcuTempMaxReading,
-           mcuTempMinReading),
+           mcuTempMinReading, conn),
     busId(busId), mcuAddress(mcuAddress), tempReg(tempReg),
-    objectServer(objectServer), dbusConnection(conn), waitTimer(io)
+    objectServer(objectServer), waitTimer(io)
 {
     sensorInterface = objectServer.add_interface(
         "/xyz/openbmc_project/sensors/temperature/" + name,