Arm backend: use ArmCompileSpec in backend

[Erik-Lundell]

Makes for more convenient access of compile spec entries.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14140

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❌ 3 New Failures, 1 Cancelled Job, 5 Unrelated Failures

As of commit 68f2839 with merge base 4c90a53 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_cat.py::TestCat::test_qs8_cat3
• trunk / test-huggingface-transformers-macos (distilbert|coreml_fp32_gpu|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-llama-torchao-lowbit / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-openvino-linux / linux-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / unittest-release / macos / macos-job (gh) (similar failure)
  ##[error]The operation was canceled.

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_test.py::TestInspector::test_disable_debug_handle_validation_with_symbolic_shapes
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_test.py::TestInspector::test_disable_debug_handle_validation_with_symbolic_shapes
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  devtools/inspector/tests/inspector_test.py::TestInspector::test_disable_debug_handle_validation_with_symbolic_shapes

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[zingo]

Got an fail :( retriggerening to se if it's random or related to PR

FAILED backends/arm/test/ops/test_sub.py::test_sub_tensor_tosa_INT_2[randn_4D_mutltiple_broadcasts] - AssertionError: Output 0 does not match reference output.
	Given atol: 0.001, rtol: 0.001.
	Output tensor shape: torch.Size([1, 4, 4, 4]), dtype: torch.float32
	Difference: max: 0.0, abs: 0.023693203926086426, mean abs error: 0.0003702063113451004.
	-- Model vs. Reference --
	 Numel: 64, 64
	Median: -0.7344886064529419, -0.7344886064529419
	  Mean: -0.5875168630154803, -0.5871466567041352
	   Max: 2.1797726154327393, 2.1797726154327393
	   Min: -3.8619885444641113, -3.8619885444641113
= 1 failed, 4659 passed, 2418 skipped, 195 xfailed, 36 xpassed, 6542 warnings, 1 rerun in 5395.78s (1:29:55) =

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@mergennachin has imported this pull request. If you are a Meta employee, you can view this in D82109615.