Arm backend: Add Amax-support for Ethos-U55

[AdrianLundell]

Additionally start deprecation of the unstable softmax decomp for u55 to be replaced by the now fully supported stable one.

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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❌ 8 New Failures, 20 Unrelated Failures

As of commit 08f84d1 with merge base 2a12f1f ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 2cde68955e03bd26199a6b1781a52fe12419bab7f5150429df47881d8547bbd3 /exec failed with exit code 137
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t f0af563023c77b973b5f1df08a8543933c126891b520bd9d05d74ed01b1559b1 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t a3391cc2d5daaca7713fa01d7377d1416ef7bfab7d1ee8687b84bd7f73af8536 /exec failed with exit code 1
• pull / test-sqnr-static-llm-qnn-linux (smollm2_135m) / linux-job (gh)
  RuntimeError: Command docker exec -t f22baaca66421aea62cc045c13bcfb348dfa087f8428cc64b71e45c199a7042b /exec failed with exit code 92
• trunk / test-qnn-model (fp32, ic4) / linux-job (gh)
  RuntimeError: Command docker exec -t 7c622c9c4c240d86150c0c9fe76a2902aa5636f419047449471538fd93d5785f /exec failed with exit code 137
• trunk / test-qnn-optimum-model (fp32, dit) / linux-job (gh)
  RuntimeError: Command docker exec -t 2c140510d13bf1691c29b194d029f6c209179b4fe9652180325cbf99c1bf5e5c /exec failed with exit code 137
• trunk / test-qnn-optimum-model (fp32, efficientnet) / linux-job (gh)
  RuntimeError: Command docker exec -t 993bf4034fe5e0d399b4f7aa99c1b0f19b482c7180d47837de7b19b850eeb76f /exec failed with exit code 137
• trunk / unittest-release / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model

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

• pull / test-phi-3-mini-runner-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-qnn-model (fp32, conv_former) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-qnn-model (fp32, dl3) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-qnn-model (fp32, ic3) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-qnn-optimum-model (fp32, distilbert) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-qnn-optimum-model (fp32, mobilevit_v2) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-qnn-optimum-model (fp32, roberta) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-qnn-optimum-model (fp32, swin) / 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

• trunk / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• trunk / test-qnn-model (fp32, mb) / linux-job (gh) (trunk failure)
• trunk / test-qnn-model (fp32, mv2) / linux-job (gh) (trunk failure)
• trunk / test-qnn-model (fp32, mv3) / linux-job (gh) (trunk failure)
• trunk / test-qnn-model (fp32, vit) / linux-job (gh) (trunk failure)
• trunk / test-qnn-model (fp32, w2l) / linux-job (gh) (trunk failure)
• trunk / test-qnn-optimum-model (fp32, albert) / linux-job (gh) (trunk failure)
• trunk / test-qnn-optimum-model (fp32, bert) / linux-job (gh) (trunk failure)
• trunk / test-qnn-optimum-model (fp32, cvt) / linux-job (gh) (trunk failure)
• trunk / test-qnn-optimum-model (fp32, focalnet) / linux-job (gh) (trunk failure)
• trunk / test-qnn-optimum-model (fp32, mobilevit_v1) / linux-job (gh) (trunk failure)
• trunk / test-qnn-optimum-model (fp32, pvt) / linux-job (gh) (trunk failure)

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[AdrianLundell]

Fails unrelated