Install Arm deps in Docker

[mansnils]

This is for Arm backend, more specifically for VGF backend.

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15812

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❌ 3 New Failures, 1 Unrelated Failure

As of commit ec59e1b with merge base 100093f ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 483765450cd4dce700c86ca0ffc4e678277d3dfbd0d3ec24954af6defb9b194b /exec failed with exit code 1
• trunk / test-arm-cortex-m-size-test (zephyr-preset) / linux-job (gh)
  RuntimeError: Command docker exec -t eeea633606a443d40852af6423fd3bdfc4354f1ecb504de49a7db869689850b7 /exec failed with exit code 1

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

• pull / test-llama-runner-linux (bf16, custom, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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