add enum value to string helpers

Only add helpers for enum in `ssl.h`.

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index caac2d5..d04f9fd 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -77,6 +77,7 @@
     sha1.c
     sha256.c
     sha512.c
+    ssl_debug_helpers_generated.c
     threading.c
     timing.c
     version.c