Remove remaining OpenCL

[daniellegillai]

Motivation

OpenCL is deprecated in rocAL, but there were still remaining references to it in the README and checks in the code.

Technical Details

Removed OpenCL backend support:

• Deleted RocalMemType::OCL and updated memory type checks from OCL || HIP to HIP only
• Deleted CHECK_CL_CALL_RET (master_graph.cpp)
• Deleted OpenCL data transfer kernels (device_data_transfer_code.h)
• Removed OpenCL from build system
• Removed OpenCL instructions from README and docs.

Test Plan

rocAL ctests.

Test Result

When in addition to this PR, PR #485 is also applied in order to fix issue #484, all 21 ctests pass.

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[rrawther]

device_data_transfer_code.h might be used for HIP backend. Please check

[Copilot]

Pull request overview

This PR completes the removal of deprecated OpenCL backend support from rocAL by deleting OpenCL-specific code paths, updating memory-type conditionals to be HIP-only for GPU flows, and removing OpenCL-facing build/setup/documentation references.

Changes:

• Removed RocalMemType::OCL and updated GPU/host branching to treat HIP as the only GPU backend.
• Deleted OpenCL-specific utilities (e.g., OpenCL transfer kernels, OpenCL CMake finder, and related macros) and removed OpenCL backend build logic.
• Updated user-facing setup/help text and docs to remove OpenCL instructions/options.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
rocAL/source/pipeline/tensor.cpp	Removes OpenCL memory mapping in vx_mem_type().
rocAL/source/pipeline/ring_buffer.cpp	Updates buffer-selection and metadata checks to treat HIP as the only GPU path.
rocAL/source/pipeline/master_graph.cpp	Removes OpenCL macro and updates GPU-affinity checks from OCL/HIP to HIP only.
rocAL/source/loaders/video/video_loader.cpp	Updates loader output handling to treat HIP as the only GPU backend.
rocAL/source/loaders/image/numpy_loader.cpp	Updates tensor update path to treat HIP as the only GPU backend.
rocAL/source/loaders/image/image_loader.cpp	Updates image update path to treat HIP as the only GPU backend.
rocAL/source/loaders/image/cifar10_loader.cpp	Updates CIFAR10 loader output handling to treat HIP as the only GPU backend.
rocAL/source/loaders/audio/audio_loader.cpp	Updates audio update path to treat HIP as the only GPU backend.
rocAL/include/pipeline/tensor.h	Updates comments related to memory type/handles after OpenCL removal.
rocAL/include/pipeline/commons.h	Removes OCL from RocalMemType and updates related documentation.
rocAL/include/device/device_data_transfer_code.h	Deletes OpenCL data transfer kernels/utilities.
rocAL/CMakeLists.txt	Removes OpenCL backend build logic and OpenCL-related checks.
rocAL-setup.py	Removes OCL backend option and OpenCL ICD install logic.
README.md	Removes OpenCL backend instructions and updates backend options in setup usage.
docs/install/rocAL-prerequisites.rst	Updates documented setup options to HIP/CPU only.
CMakeLists.txt	Updates printed backend options to remove OPENCL.
cmake/FindOpenCL.cmake	Removes custom OpenCL finder module.

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[kiritigowda]

@daniellegillai please address copilot review