Add HiFi-optimized Xtensa Logistic and Tanh kernels - #3728
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Optimize the Xtensa logistic and tanh kernels using the HiFi NNLib LUT ops (int8 + sym16s), adding logistic_common.cc (LUT init) and xtensa_logistic.h. Registers logistic_common.cc in xtensa_makefile.inc. Depends on the 09_03_2026 NNLib release (PR#3703) for the LUT APIs (e.g. xa_nn_init_lut_asym8s_sigmoid, xa_nn_init_lut_asym8s_tanh, xa_nn_vec_apply_lut_asym8s_asym8s).
Add HIFI_IQ to the include guard so xa_nnlib_api.h and xa_nnlib_standards.h are pulled in for the hifi_iq build.
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Optimize the Xtensa logistic and tanh kernels using the HiFi NNLib LUT ops (int8 + sym16s), adding logistic_common.cc (LUT init) and xtensa_logistic.h. Registers logistic_common.cc in xtensa_makefile.inc.
Depends on the 09_03_2026 NNLib release (PR#3703)
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