Make NXP batch norm tests runnable in BUCK

[JakeStevens]

Summary:
Make the NXP test_batch_norm_fusion tests compatible with the BUCK build
system. The tflite import in executors.py is made optional since
tensorflow/tflite_runtime are not available in the BUCK environment. The tests enabled do not rely on the functionality enabled by tflite.

Differential Revision: D93880277

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17597

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❌ 6 New Failures, 1 Unrelated Failure

As of commit 0407ea9 with merge base 255e9e0 ():

NEW FAILURES - The following jobs have failed:

• pull / test-coreml-bc-macos (macos-m1-stable) / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-mediatek-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2e6e84dda0470e76a3dfc9a3aaa81053489c26de20e81b2ad7fa0da4459c595d /exec failed with exit code 2
• pull / test-openvino-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 81b64683a239872b1dc214911ba04ab9d05a53cfddd5b5f67af7248fd604e2d7 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 0a96d33a7eef4e13436665b9434b2cc4d6cb1fb09e14e1c11b0e5450332dff45 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 9531aba9539887d136561459acdd39a15b4009bebed34c2fe198e7316f15a71f /exec failed with exit code 1
• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t b959c977bd6200994e9d837c0cdc148406b62f641f4704d551e61f697ef6132a /exec failed with exit code 3

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest-buck / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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[meta-codesync]

@JakeStevens has exported this pull request. If you are a Meta employee, you can view the originating Diff in D93880277.

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