layers: Update 'string' layer header files
Remove struct_string_helper header files, add in enum_string_helper
and <sstream> as these were included in the removed header file.
Change-Id: Ice0842ce2f06b5581a5add739534d59d834edbf6
diff --git a/layers/threading.cpp b/layers/threading.cpp
index 565a8b2..f73774c 100644
--- a/layers/threading.cpp
+++ b/layers/threading.cpp
@@ -31,7 +31,7 @@
#include "vk_layer_logging.h"
#include "threading.h"
#include "vk_dispatch_table_helper.h"
-#include "vk_struct_string_helper_cpp.h"
+#include "vk_enum_string_helper.h"
#include "vk_layer_data.h"
#include "vk_layer_utils.h"