Add custom ops deps

Summary:
Add dependency in buck for model sharding op
```
buck run mode/dev-nosan //executorch/examples/qualcomm/oss_scripts/llama3_2:llama_qnn -- --compile_only --ptq 16a4w --checkpoint /home/chenlai/local//consolidated.00.pth --params /home/chenlai/local//params.json --tokenizer_model /home/chenlai/local//tokenizer.model --prompt "Once" -m SM8650 --model_size 1B --model_mode hybrid --build_folder /home/chenlai/local   2>&1 | tee static_llama.log

```

Differential Revision: D67814096

Author: cccclai

examples/qualcomm/oss_scripts/llama3_2/TARGETS

@@ -9,6 +9,9 @@ python_binary(
     name = "llama",
     srcs = ["llama.py"],
     main_function = "executorch.examples.qualcomm.oss_scripts.llama3_2.llama.main",
+    preload_deps = [
+        "//executorch/extension/llm/custom_ops:model_sharding_py",
+    ],
     deps = [
         "//executorch/examples/qualcomm/oss_scripts/llama2:static_llama",
         "//caffe2:torch",