Update on "Introduce hydra framework with backwards compatibility"

Differential Revision: [D75263989](https://our.internmc.facebook.com/intern/diff/D75263989)

[ghstack-poisoned]

Author: jackzhxng

examples/models/llama/config/targets.bzl

@@ -13,3 +13,19 @@ def define_common_targets():
             "@EXECUTORCH_CLIENTS",
         ],
     )
+
+    runtime.python_library(
+        name = "llm_config_utils",
+        srcs = [
+            "llm_config_utils.py",
+        ],
+        _is_external_target = True,
+        base_module = "executorch.examples.models.llama.config",
+        visibility = [
+            "//executorch/...",
+            "@EXECUTORCH_CLIENTS",
+        ],
+        deps = [
+            ":llm_config",
+        ],
+    )