Fix the build broken of examples/llm_manual used in llm/getting-started.md

[DamonFool]

Hi all,

While I was following https://docs.pytorch.org/executorch/main/llm/getting-started , the cmake build was broken due to the following error:

CMake Error at third-party/executorch/tools/cmake/common/preset.cmake:122 (message):
  Use of 'EXECUTORCH_BUILD_EXTENSION_MODULE' requires
  'EXECUTORCH_BUILD_EXTENSION_FLAT_TENSOR'
Call Stack (most recent call first):
  third-party/executorch/tools/cmake/preset/default.cmake:300 (check_required_options_on)
  third-party/executorch/CMakeLists.txt:87 (include)

It would be better to fix it.
Thanks.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12095

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❌ 2 New Failures

As of commit d1a3fa6 with merge base db8ef6b ():

NEW FAILURES - The following jobs have failed:

• pull / test-llava-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 73aab438b53b90d7d8bc13f3da1d54daf827f5c4f4c8bb5b258ef4c67e3b3699 /exec failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_exp.py::TestExp::test_fp16_exp

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[DamonFool]

I had signed the CLA just now.

[DamonFool]

The two failures should not be related to this change.
Thanks.