NXP backend: Remove broadcasting restrictions

[roman-janik-nxp]

Summary

Removes broadcasting restrictions. After full Permute_copy/Transpose support full broadcast can be enabled. Transpose is required for broadcasting ops with inputs with different dim order. Small refactoring of tests.

Test plan

Tests provided.

cc @robert-kalmar

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20412

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❗ 1 Active SEVs

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• [ROCm] MI350 CI jobs will have longer queue times due to CI migration

❌ 3 New Failures, 2 Unrelated Failures

As of commit e475ab1 with merge base 55c54c7 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 4fe41a28f441fc01d6bb8d266246dc40533507c77d11c3e86a2fefedb80e2e5b /exec failed with exit code 137
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 982b0b08b3326f4d07c41ee883ea678a9697f22d961ec390824b1010e66b77ad /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2deff4cc56a4eef10ff28336410276ebfa2302d590af2b8575ae641544c9b525 /exec failed with exit code 1

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

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

• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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