Arm backend: Support SNORM RGBA runtime format

[robell]

Arm backend: Support SNORM RGBA runtime format

This format was missing from runtime tables for some sampler support paths.

Signed-off-by: Rob Elliott Robert.Elliott@arm.com
Change-Id: Iefb9a232aa432a143fb695b5b5cf4efafe508061

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

[pytorch-bot]

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❌ 1 New Failure, 4 Unrelated Failures, 2 Unclassified Failures

As of commit c265b46 with merge base 69a9918 ():

NEW FAILURE - The following job has failed:

• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7dde8b65b5912d073ac27ba51108b746332a4777b3e89bdc13f3a670b2769480 /exec failed with exit code 3

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• trunk / test-huggingface-transformers-macos (distilbert|coreml_fp32_gpu|--quantize) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  The process '/opt/homebrew/bin/git' failed with exit code 128
• trunk / test-huggingface-transformers-macos (smollm2-135m|coreml_fp32_gpu|--quantize) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  The process '/opt/homebrew/bin/git' failed with exit code 128

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

• pull / test-models-linux-basic (mv3, xnnpack-quantization-delegation, buck2, linux.2xlarge, executorch-u... / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• Test ARM Backend / test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• trunk / test-models-linux-aarch64 (mv2, portable, linux.arm64.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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

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

• pull / unittest-buck / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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