common: code re-org

Move common files under a common/ directory.

Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
Change-Id: I0eaf91d4ee94c1e78228da0c50892f82e91912fa
diff --git a/tool/pldm_cmd_helper.hpp b/tool/pldm_cmd_helper.hpp
index 814de45..7e7f03a 100644
--- a/tool/pldm_cmd_helper.hpp
+++ b/tool/pldm_cmd_helper.hpp
@@ -5,7 +5,7 @@
 #include "libpldm/fru.h"
 #include "libpldm/platform.h"
 
-#include "utils.hpp"
+#include "common/utils.hpp"
 
 #include <err.h>
 #include <sys/socket.h>