Move simple options to default preset

[jathu]

Summary

• Move the simple options to default preset. This shouldn't change any build configurations
• Rename BUILD_EXECUTORCH_PORTABLE_OPS to EXECUTORCH_BUILD_PORTABLE_OPS

Test plan

CI

cc @larryliu0820

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10804

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures

As of commit 81af638 with merge base 756f86a ():

NEW FAILURES - The following jobs have failed:

• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t 35bfcb427e91ef6bf71be951dfbacbb4e3849192a04280dd0b5fc0a964c27fcd /exec failed with exit code 1
• trunk / test-models-macos (llama3_2_vision_encoder, portable) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos (resnet50, xnnpack-quantization-delegation) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-selective-build-macos (cmake) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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