kernel/riscv64:fixed the performance problem in RISCV64_ZVL256 when OPENBLAS_K is small #5291
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I made these two code modifications to address the HBMV issue. When the computation scale is too small, the performance of RVV is very poor. Therefore, I call the unvectorized code when the scale is small.
The numbers 8 and 16 in the code are the balance points I found. Around these values, the performance of the RVV version and the unvectorized version is close.