peltool: Print the Words6To9 'Description' field

Include the 'Description' field from the Words6To9 registry entry when printing
SRC error details.

Changed from this:

"Error Details": {
    "Message":              "There was a failure when reading a sensor device",
    "CALLOUT_ERRNO":        "0x5"
}

to this:

"Error Details": {
    "Message":              "There was a failure when reading a sensor device",
    "CALLOUT_ERRNO": [
                            "0x5",
                            "errno of the failure"
    ]
}

Signed-off-by: Harisuddin Mohamed Isa <harisuddin@gmail.com>
Change-Id: Icc107b0516062eb891f14f3ff3f3cffd316c6d77
diff --git a/test/openpower-pels/Makefile.include b/test/openpower-pels/Makefile.include
index a098ad9..d250b77 100644
--- a/test/openpower-pels/Makefile.include
+++ b/test/openpower-pels/Makefile.include
@@ -183,7 +183,8 @@
 	$(test_ldadd) \
 	$(pel_test_utils_ldadd) \
 	$(top_builddir)/extensions/openpower-pels/registry.o \
-	$(top_builddir)/extensions/openpower-pels/pel_values.o
+	$(top_builddir)/extensions/openpower-pels/pel_values.o \
+	$(top_builddir)/extensions/openpower-pels/json_utils.o
 registry_test_LDFLAGS = $(test_ldflags)
 
 severity_test_SOURCES = %reldir%/severity_test.cpp