Export util headers for openpower-hw-diags

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I69cebf3d1637189ee4fa2c5f03725d51d89618c1
diff --git a/src/util/hei_bit_string.cpp b/src/util/hei_bit_string.cpp
index 53a4d4c..bf1dfdd 100644
--- a/src/util/hei_bit_string.cpp
+++ b/src/util/hei_bit_string.cpp
@@ -2,7 +2,7 @@
  *  @brief BitString and BitStringBuffer class definitions
  */
 
-#include <hei_bit_string.hpp>
+#include <util/hei_bit_string.hpp>
 #include <util/hei_includes.hpp>
 
 #include <algorithm>