Fix export_and_delegate.py

#4141 missed updating export_and_delegate.py. This PR adds it.

Differential Revision: [D59547264](https://our.internmc.facebook.com/intern/diff/D59547264/)

[ghstack-poisoned]

Author: helunwencser

examples/portable/scripts/export_and_delegate.py

@@ -17,11 +17,11 @@
 from executorch.exir.backend.test.op_partitioner_demo import AddMulPartitionerDemo
 from executorch.exir.capture._config import ExecutorchBackendConfig
 
+from executorch.extension.export_util import export_to_edge
+
 from ...models import MODEL_NAME_TO_MODEL
 from ...models.model_factory import EagerModelFactory
 
-from ..utils import export_to_edge
-
 
 FORMAT = "[%(levelname)s %(asctime)s %(filename)s:%(lineno)s] %(message)s"
 logging.basicConfig(level=logging.INFO, format=FORMAT)