Revert "Arm backend: Deprecate internal models using aot_arm_compiler (pytorch#15302)"

This reverts commit cea66e3.

Author: GregoryComer

examples/arm/aot_arm_compiler.py

@@ -91,11 +91,6 @@ def _load_internal_model(
     model_name: str, example_inputs: Any
 ) -> Optional[Tuple[torch.nn.Module, Any]]:
     """Load a bundled example model from the internal `MODELS` mapping."""
-    logging.info(
-        "Loading internal models is deprecated. Use --model_name <FILE>.py/.pt "
-        "or a model from examples/models."
-    )
-
     if model_name not in MODELS:
         return None
 
@@ -447,7 +442,7 @@ def get_args():
         "-m",
         "--model_name",
         required=True,
-        help=f"Model file .py/.pth/.pt or a model from examples/models. Valid names: {set(MODEL_NAME_TO_MODEL.keys())}",
+        help=f"Model file .py/.pth/.pt, builtin model or a model from examples/models. Valid names: {set(list(MODELS.keys()) + list(MODEL_NAME_TO_MODEL.keys()))}",
     )
     parser.add_argument(
         "--model_input",