[APU] Add MTK APU backend #3407
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…into hongming/mtk_apu_backend
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新增MTK MT8175 APU的支持，目前仅支持全量化MobileNetv1模型。
遗留问题
动态加载libneuron_adapter.so的相关文件存在大量冗余代码，建议仿照lite/backends/opencl/cl_wrapper.h和lite/opencl/cl_wrapper.cc，在/lite/backends/apu目录下实现neuron_wrapper.h和neuron_wrapper.cc。
或采用如下方案：PaddleLite+APU编译时链接到libneuron_adapter.so，但libneuron_adapter.so内部通过dlopen的方式加载其它库，这样就能避免cmake/device/apu.cmake设置更多系统库的依赖了