Arm backend: Enable host memory capabilities with fixed buck deps.

[wwwind]

Enable the reverted #23321

The reported issue with buck should be fixed.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/23322

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 921b847 with merge base 5e21c13 ():

NEW FAILURE - The following job has failed:

• Cadence Build & Test / Resolve CI docker image / resolve (gh)
  ##[error]Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step.

BROKEN TRUNK - The following job failed but were present on the merge base:

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

• trunk / test-samsung-models-linux / linux-job (gh) (trunk failure)
  test_yolo26

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[wwwind]

2 jobs are failing and they are not relevant