Use const_data_ptr/mutable_data_ptr instead of deprecated data_ptr

[cyyever]

ExecuTorch Tensor::data_ptr is ET_DEPRECATED. Replace remaining call sites: read-only accesses use const_data_ptr, the rest use mutable_data_ptr (sampler input, CMSIS-NN struct fields, JNI/mmap'd buffers that require non-const pointers).

Left unchanged: backends/aoti/slim (SlimTensor has no const/mutable variants) and at::Tensor::data_ptr() in extension/pybindings (not deprecated; for_blob takes void*).

Authored with Claude Code.

[pytorch-bot]

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❌ 6 New Failures, 1 Unrelated Failure

As of commit fb9f428 with merge base e16c048 ():

NEW FAILURES - The following jobs have failed:

• Test CUDA Builds / check-all-cuda-builds (gh)
  Process completed with exit code 1.
• Test CUDA Builds / test-executorch-cuda-build-12.6 / linux-job (gh)
  /pytorch/executorch/backends/cuda/runtime/cuda_mutable_state.cpp:154:61: error: ‘const class executorch::backends::aoti::slim::SlimTensor’ has no member named ‘mutable_data_ptr’
• Test CUDA Builds / test-executorch-cuda-build-13.0 / linux-job (gh)
  /pytorch/executorch/backends/cuda/runtime/cuda_mutable_state.cpp:154:61: error: ‘const class executorch::backends::aoti::slim::SlimTensor’ has no member named ‘mutable_data_ptr’
• Test CUDA Builds / test-models-cuda / linux-job (gh)
  /pytorch/executorch/backends/cuda/runtime/cuda_mutable_state.cpp:154:61: error: ‘const class executorch::backends::aoti::slim::SlimTensor’ has no member named ‘mutable_data_ptr’
• Test CUDA Builds / unittest-cuda / linux-job (gh)
  /pytorch/executorch/backends/cuda/runtime/cuda_mutable_state.cpp:154:61: error: ‘const class executorch::backends::aoti::slim::SlimTensor’ has no member named ‘mutable_data_ptr’
• Test CUDA Builds / unittest-cuda-runtime / linux-job (gh)
  /pytorch/executorch/backends/cuda/runtime/cuda_mutable_state.cpp:154:61: error: ‘const class executorch::backends::aoti::slim::SlimTensor’ has no member named ‘mutable_data_ptr’

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-models-linux (add, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[rascani]

Thanks @cyyever! This LGTM, just one cleanup on cuda_mutable_state.cpp