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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• Unrelated MacOS MPS test jobs time out (30 min) due to stale cpp_extension lock file poisoning self-hosted runners

❌ 1 New Failure, 4 Pending

As of commit bb52040 with merge base 564e655 ():

NEW FAILURE - The following job has failed:

• pull / unittest-buck / linux / linux-job (gh)
  RuntimeError: Command docker exec -t efec52f27db1495ae3dfc2ce7b8002b90e499a68a88df5520f2107b28f213ef6 /exec failed with exit code 3

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[github-actions]

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[rascani]

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

[nil-is-all]

Hi @cyyever, thanks for the PR! Could you review the CUDA build CI test failures and fix them?

[cyyever]

@nil-is-all Fixed