Revert "Arm backend: Remove submodule serialization_lib"

[zingo]

Reverts #13178

cc @digantdesai @freddan80 @per @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13180

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❌ 2 New Failures, 2 Pending, 3 Unrelated Failures

As of commit 91f719e with merge base 8dfcb21 ():

NEW FAILURES - The following jobs have failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 5aff8d73fd3e116d35593956e4117988e9cd525af7d6a1b7e83eda538797e1a9 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t d8f53261dc0e7602ee397b31604fc637b6866d5e143e203f95fd1d0a084e373d /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 / test-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'
• pull / unittest / linux / linux-job (gh) (trunk failure)
  /pytorch/executorch/backends/vulkan/runtime/graph/ops/impl/Reduce.cpp:41:26: error: 'get_tensor' is a protected member of 'vkcompute::ComputeGraph'
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  /pytorch/executorch/backends/vulkan/runtime/graph/ops/impl/Reduce.cpp:41:26: error: 'get_tensor' is a protected member of 'vkcompute::ComputeGraph'

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[zingo]

Failed tests are unrelated