[LITE][NPU] Add fusion_elementwise_add_activation bridge, remove the limitation of the dimensions of input tensors in the graph compute kernel, and refine log message (#2395)

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* Add supporting for Huawei offical DDK
* Fix the param of graph op in NPU graph computing kernel

* move lite/backends/npu/bridges --> lite/kernels/npu/

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* fix namespace for npu

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* mv npu runtime file to lite/backends/npu

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