Add Xtensa HiFi activation kernels - #3665
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Adds Xtensa optimized activations (relu/relu6 int8+float32), hard_swish (int8), and PReLU (int8) kernels with shared prelu_common helper and xtensa_prelu.h declarations. All NNLib APIs already exist in the current release.
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Adds Xtensa optimized activation kernels: relu (int8 + float32), hard_swish (int8), and PReLU (int8). Includes shared prelu_common prepare helper and xtensa_prelu.h declarations.
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