Remove gen_tokens.h header as it is empty/unused code (#23150)

Author: andy31415

src/app/util/config.h

@@ -31,8 +31,6 @@
 #include <zap-generated/endpoint_config.h>
 #endif
 
-#include <zap-generated/gen_tokens.h> // For GENERATED_TOKEN_LOADER/SAVER macros
-
 // *******************************************************************
 // pre-defined Devices
 //

src/app/zap-templates/app-templates.json

@@ -69,11 +69,6 @@
             "name": "ZCL gen_config header",
             "output": "gen_config.h"
         },
-        {
-            "path": "templates/app/gen_tokens.zapt",
-            "name": "ZCL gen_tokens header",
-            "output": "gen_tokens.h"
-        },
         {
             "path": "templates/app/CHIPClientCallbacks.zapt",
             "name": "CHIP Client Callbacks header",