Add import for quantized decomposed ops

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Author: larryliu0820

torchchat/model.py

@@ -961,6 +961,9 @@ def apply_rotary_emb(x: Tensor, freqs_cis: Tensor) -> Tensor:
     from executorch.extension.pybindings import portable_lib as exec_lib
 
     # ET changed the way it's loading the custom ops so it's not included in portable_lib but has to be loaded separately.
+    # For quantized_decomposed ops
+    from executorch.kernels import quantized  # no-qa
+    # For llama::sdpa_with_kv_cache.out, preprocess ops
     from executorch.extension.llm.custom_ops import sdpa_with_kv_cache  # no-qa
 
     class PTEModel(nn.Module):