Add function to get PMBus device name

This will be used in the future to find a path
to certain sysfs files.

Change-Id: Ia919b2f954fddf7b97bd1c5025f7c54af942b318
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/pmbus.hpp b/pmbus.hpp
index 187f383..9ab57c0 100644
--- a/pmbus.hpp
+++ b/pmbus.hpp
@@ -253,6 +253,15 @@
     private:
 
         /**
+         * Returns the device name
+         *
+         * This is found in the 'name' file in basePath.
+         *
+         * @return string - the device name
+         */
+        std::string getDeviceName();
+
+        /**
          * The sysfs device path
          */
         fs::path basePath;