Arm backend: Update VelaIO handling

[digantdesai]

Combined version of #13282 and #14062, replacing #14016

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14135

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❌ 2 Cancelled Jobs, 3 Pending, 6 Unrelated Failures

As of commit 7ef8e57 with merge base 3124a6b ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-setup-linux-gcc / linux-job (gh)
• pull / unittest / linux / linux-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.2xlarge, executorch-ubuntu-22.04... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (resnet18, portable, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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