Arm backend: Remove duplicate tosa_spec assignment in tosa partitioner

[Sebastian-Larsson]

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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❌ 2 New Failures, 1 Unrelated Failure

As of commit ddd67d8 with merge base ec4c462 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t bc713f6e808a5609110c86f60a979de5329b97189865f53bdb38e45df67b25b3 /exec failed with exit code 3
• trunk / test-arm-backend-ethos-u (test_model_smollm2-135M) / linux-job (gh)
  RuntimeError: Command docker exec -t 4e70a1aa6d5e8d3dd793f75b85b3f5169b4470a90961c4f0b2694e043d4b4a72 /exec failed with exit code 2

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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[zingo]

buck to failed with mentioning Arm stuff :( No idea if this a related, Rerun tests
cortex-m also had fails, retriggered but maybe it needs to be rebase.

Error evaluating expression:
    //backends/apple/... + //backends/<<omitted>>hema/... + //test/... + //util/...
    ^-----------------------------------------------------------------------------^


Caused by:
    0: Error evaluating expression:
           //backends/apple/... + //backends/arm: + //backends/arm/debug/... + //backends/arm/operator_support/... + //backends/arm/operators/... + //backends/arm/_passes/... + //backends/arm/runtime/... + //backends/arm/tosa/... + //backends/example/... + //backends/mediatek/... + //backends/transforms/... + //backends/xnnpack/... + //codegen/tools/... + //configurations/... + //extension/flat_tensor: + //extension/llm/runner: + //kernels/aten/... + //kernels/optimized/... + //kernels/portable/... + //kernels/quantized/... + //kernels/test/... + //runtime/... + //schema/... + //test/... + //util/...
                                                                                                                                                                                                                                                                                                                       ^--------------------^
       
    1: From load at backends/xnnpack/test/BUCK:8
    2: File not found: `shim_et//xplat/caffe2/pt_defs.bzl`

Looking at the PR and the output it don't seem so and it seem to point out xnnpack.

[zingo]

OK to merge but got some strange CI errors let see if we can get pased those.

[zingo]

Rerunning some test seem to have cleaned out some problems.