Integrate openpower-libhei with openpower-hw-diags

Pull down openpower-libhei as a subproject and build the isolator
support into openpower-hw-diags.

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: I6eeacc802363fec6f0f113e75eb268a8c1774b7c
diff --git a/src/hei_user_defines.hpp b/src/hei_user_defines.hpp
new file mode 100644
index 0000000..797f22e
--- /dev/null
+++ b/src/hei_user_defines.hpp
@@ -0,0 +1,25 @@
+#pragma once
+
+/**
+ * @file hei_user_defines.hpp
+ * @brief The purpose of this file is to create common defines that
+ *        will be used throughout this library.
+ */
+
+#include <assert.h>
+#include <inttypes.h>
+#include <stdio.h>
+
+#define HEI_INF(...)                                                           \
+    {                                                                          \
+        printf("HWDIAGS I> " __VA_ARGS__);                                     \
+        printf("\n");                                                          \
+    }
+
+#define HEI_ERR(...)                                                           \
+    {                                                                          \
+        printf("HWDIAGS E> " __VA_ARGS__);                                     \
+        printf("\n");                                                          \
+    }
+
+#define HEI_ASSERT(expression) assert(expression);