Arm backend: Add BF16 support to operators pt. 4-5

[Erik-Lundell]

ge, gt, alias_copy, index_tensor
mapping to TOSA operators
GATHER, GREATER, GREATER_EQUAL, IDENTITY

log, maxpool_2d, log, matmul, maximum, minimum
mapping to TOSA operators
LOG, MATMUL, MAXIMUM, MINIMUM, MAX_POOL2D

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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❌ 6 New Failures, 4 Pending

As of commit a885837 with merge base cfc71fe ():

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 360f93ded9ad2e0f7082b20cea555333e3ab8fe7a6cfd2e41da530abf8d7dbb5 /exec failed with exit code 1
• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 29dd46308f5a7914492a8e9c2433d2b115002914f0c5fd2096b1ad3ff761488a /exec failed with exit code 3
• pull / unittest-buck / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d
• trunk / test-arm-backend-ethos-u (test_model_smollm2-135M) / linux-job (gh)
  RuntimeError: Command docker exec -t a09d435ceb4d1bc6ae6b3ee4d707ea42d90f8cf6913fd18b8897adce442aafef /exec failed with exit code 2
• trunk / unittest-release / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model

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