rusticl: Add clCreateSubDevices stub
unified-runtime tries to call this unconditionally. It handles errors correctly, but calling None here isn't an error, it's a crash. Just return CL_INVALID_VALUE so we don't crash.
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unified-runtime tries to call this unconditionally. It handles errors correctly, but calling None here isn't an error, it's a crash. Just return CL_INVALID_VALUE so we don't crash.