Fix tutorial for Qualcomm AI Engine Direct Backend (#2956)

[kirklandsign]

Summary:
We have refactors recently and need to update the tutorial and cmake.

See #2955 for isseues.

Pull Request resolved: #2956

Reviewed By: mcr229, cccclai

Differential Revision: D55947725

Pulled By: kirklandsign

fbshipit-source-id: f23af28b9a8fe071223d8ffa922a6cd4e49efe61
(cherry picked from commit c7fd394)

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3026

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures

As of commit 09f8afe with merge base d3326a2 ():

NEW FAILURES - The following jobs have failed:

• pull / test-models-linux (cmake, llava_encoder, portable, linux.4xlarge, 90) / linux-job (gh)
  RuntimeError: Command docker exec -t b1979b73fcee670474662089478e32230981b13d25699d96d10656dfefcb4970 /exec failed with exit code 1
• pull / test-pybind-build-linux (cmake) / linux-job (gh)
  RuntimeError: Command docker exec -t a99160cd0ecdc9636b7a67a8228ae3af4ed09437ce0c5255af6f90bb7219e228 /exec failed with exit code 1

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