Add interface exposing utility functions

Add utility functions enabling easy method calls on sdbusplus interface
binding objects.

Change-Id: Ie1d01f82604406705869fea0ec19d84c95d90474
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/utils.hpp b/utils.hpp
index 2dbd3b6..4ebb2a3 100644
--- a/utils.hpp
+++ b/utils.hpp
@@ -77,6 +77,18 @@
                 std::forward<Held>(held));
     }
 
+    /** @brief Provides a weak reference to the held interface. */
+    T& get()
+    {
+        return _held;
+    }
+
+    /** @brief Provides a weak reference to the held interface. */
+    const T& get() const
+    {
+        return _held;
+    }
+
     protected:
         T _held;
 };