Adding ISDIMM support

Added ISDIMM support for Bonnell machine

Change-Id: Ifdb2fc9e2d38267c8eb6cd5848d30102ab48efd1
Signed-off-by: jinuthomas <jinu.joy.thomas@in.ibm.com>
diff --git a/types.hpp b/types.hpp
index 7619aef..a98a4f3 100644
--- a/types.hpp
+++ b/types.hpp
@@ -29,7 +29,7 @@
 using Property = std::string;
 using Value = std::variant<bool, size_t, int64_t, std::string, Binary>;
 using PropertyMap = std::map<Property, Value>;
-using kwdVpdValueTypes = std::variant<size_t, Binary>;
+using kwdVpdValueTypes = std::variant<size_t, Binary, std::string>;
 
 using Interface = std::string;
 using InterfaceMap = std::map<Interface, PropertyMap>;