PEL: private header in JSON

The PELTool application is able to convert sections to JSON. This commit
takes care of converting the private header section to JSON.

private header section in JSON sample:

"Private Header":[
 {"Section Version": "1"},
 {"Sub-section type": "0"},
 {"Log Committed by": "0x1000"},
 {"Entry Creation": "10/24/2019  15:50:08"},
 {"Entry Commit": "10/24/2019  15:50:08"},
 {"Creator ID": "BMC"},
 {"Creator Implementation": ""},
 {"Platform Log ID": "0x50000004"},
 {"Log Entry ID": "0x50000004"}
]

Signed-off-by: Aatir <aatrapps@gmail.com>
Change-Id: I8b0d7dc7b70cd2a03f67f7c9a48755803634005d
diff --git a/extensions/openpower-pels/pel_values.hpp b/extensions/openpower-pels/pel_values.hpp
index 49aa374..9d49dbe 100644
--- a/extensions/openpower-pels/pel_values.hpp
+++ b/extensions/openpower-pels/pel_values.hpp
@@ -82,6 +82,11 @@
  */
 extern const std::map<std::string, std::string> sectionTitles;
 
+/**
+ * @brief Map for creator IDs
+ */
+extern const std::map<std::string, std::string> creatorIDs;
+
 } // namespace pel_values
 } // namespace pels
 } // namespace openpower