Update IsolationNode to fit new Chip Data File design

Change-Id: I3671585c4ab7a9c6c5f4b05e13782c0ea698ad12
Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
diff --git a/src/register/hei_register.hpp b/src/register/hei_register.hpp
index ff8999c..7cc28eb 100644
--- a/src/register/hei_register.hpp
+++ b/src/register/hei_register.hpp
@@ -44,4 +44,7 @@
 // Pure virtual destructor must be defined.
 inline Register::~Register() {}
 
+/** Pointer management for Register objects. */
+using RegisterPtr = std::shared_ptr<const Register>;
+
 } // end namespace libhei