Arm backend: Remove instance checks for Tosa_1.00

[Sebastian-Larsson]

With tosa 0.80 removed there's no need to check which tosa version's being used.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13219

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❌ 3 New Failures, 3 Unrelated Failures

As of commit a46a9c8 with merge base 564b6e0 ():

NEW FAILURES - The following jobs have failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 1748cc397646666ab12bdab5e828808e08dbc720160867f7f6a2c1c87183096d /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  backends/xnnpack/test/passes/test_channels_last_tagged_reshape.py::TestChannelsLastTaggedReshapePass::test_q_dq_nodes_around_copy_are_tagged
• trunk / test-models-arm-zephyr (add) / linux-job (gh)
  RuntimeError: Command docker exec -t 158dd6db4ee38dfcd8b506707194335ea8ba8ee450bc3ce9c4adbef802063576 /exec failed with exit code 1

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-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'
• pull / unittest / linux / linux-job (gh) (trunk failure)
  /pytorch/executorch/backends/vulkan/runtime/graph/ops/impl/Reduce.cpp:41:26: error: 'get_tensor' is a protected member of 'vkcompute::ComputeGraph'
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  /pytorch/executorch/backends/vulkan/runtime/graph/ops/impl/Reduce.cpp:41:26: error: 'get_tensor' is a protected member of 'vkcompute::ComputeGraph'

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[zingo]

test fails are unrelated