examples: switch to nhwc

[vgvozdeva]

Description

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Fixes # (github issue)

Checklist

General

• Do all unit and benchdnn tests (make test and make test_benchdnn_*) pass locally for each commit?
• Have you formatted the code using clang-format?

Performance improvements

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Bug fixes

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[vgvozdeva]

make test
set test_scope=NIGHTLY

[vgvozdeva]

make test
set test_scope=NIGHTLY

[Copilot]

Pull request overview

This PR updates oneDNN example code to use NHWC as the user-facing plain (non-blocked) layout instead of NCHW, aligning examples and accompanying tutorial text around NHWC across C, C++, SYCL, and OpenCL interop samples.

Changes:

• Switched example memory descriptors from nchw/dnnl_nchw to nhwc/dnnl_nhwc across many examples.
• Updated tutorial/documentation text in several examples to reference NHWC.
• Adjusted C example tensor initialization indexing to match NHWC physical layout.

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
examples/sycl_interop_usm.cpp	Switches SYCL USM interop example tensor layout to NHWC.
examples/sycl_interop_buffer.cpp	Switches SYCL buffer interop example tensor layout + comment to NHWC.
examples/primitives/sum.cpp	Uses NHWC for source memory descriptors in sum example.
examples/primitives/shuffle.cpp	Uses NHWC for src/dst memory descriptors in shuffle example.
examples/primitives/resampling.cpp	Uses NHWC for src/dst memory descriptors in resampling example.
examples/primitives/reorder.cpp	Uses NHWC for src memory descriptor in reorder example.
examples/primitives/reduction.cpp	Uses NHWC for src/dst memory descriptors in reduction example.
examples/primitives/prelu.cpp	Updates comments and user/src MDs to NHWC in PReLU example.
examples/primitives/pooling.cpp	Uses NHWC for src/dst memory descriptors in pooling example.
examples/primitives/lrn.cpp	Uses NHWC for src/dst memory descriptors in LRN example.
examples/primitives/inner_product.cpp	Updates comment and uses NHWC for src memory descriptor.
examples/primitives/eltwise.cpp	Uses NHWC for src/dst memory descriptors in eltwise example.
examples/primitives/deconvolution.cpp	Updates comment and uses NHWC for user src/dst memories.
examples/primitives/convolution.cpp	Updates comment and uses NHWC for user src/dst memories (incl. depthwise).
examples/primitives/concat.cpp	Uses NHWC for source memory descriptors in concat example.
examples/primitives/binary.cpp	Uses NHWC for src/dst memory descriptors in binary example.
examples/primitives/batch_normalization.cpp	Uses NHWC for src/dst memory descriptors in batchnorm example.
examples/performance_profiling.cpp	Updates narrative + user memory objects for naive implementation to NHWC.
examples/memory_format_propagation.cpp	Updates narrative + user src/dst memory objects to NHWC.
examples/gpu_opencl_interop.cpp	Switches OpenCL interop example memory descriptor to NHWC and updates docs.
examples/cross_engine_reorder.cpp	Uses NHWC for CPU/GPU memory descriptors in cross-engine reorder example.
examples/cross_engine_reorder.c	Uses dnnl_nhwc for CPU/GPU memory descriptors in C cross-engine reorder.
examples/cpu_cnn_training_f32.c	Switches user tensors to NHWC and updates 4D init indexing for NHWC.
examples/cnn_training_f32.cpp	Switches user src/dst/pool tensors to NHWC (and fixes diff-weights tag).
examples/cnn_training_bf16.cpp	Switches user src/dst/pool tensors to NHWC (and fixes diff-weights tag).
examples/cnn_inference_int8.cpp	Switches user src/dst tensors to NHWC in int8 inference example.
examples/cnn_inference_f32.cpp	Switches user src tensor to NHWC and updates accompanying comment.
examples/cnn_inference_f32.c	Switches user tensors to NHWC and updates 4D init indexing for NHWC.

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