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/libpldmresponder/pdr_utils.hpp b/libpldmresponder/pdr_utils.hpp
index e644534..2843ee6 100644
--- a/libpldmresponder/pdr_utils.hpp
+++ b/libpldmresponder/pdr_utils.hpp
@@ -2,8 +2,8 @@
 
 #include "libpldm/pdr.h"
 
-#include "types.hpp"
-#include "utils.hpp"
+#include "common/types.hpp"
+#include "common/utils.hpp"
 
 #include <stdint.h>