[API][OPENCL] add opencl tune api for user. test=develop #4016
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主要内容
Config新增APIset_opencl_tune，可以让用户是否选择打开或关闭auto tune。虽然性能更好，但第一次跑会tune花较长时间；PS：对于比较弱的机器，还有只跑一次推理的场景，就可能不太适合开。所以交给用户选择，后续关于高通的kernel tune策略还需要进一步分析。