ggml-cpu:add RISC-V RVV (Zvfh) optimization for FP16 vector scaling (#17314)
* ggml-cpu:add RISC-V RVV (Zvfh) optimization for FP16 vector scaling
Signed-off-by: Wang Yang <yangwang@iscas.ac.cn>
* fix comment
* fix comment 2
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Signed-off-by: Wang Yang <yangwang@iscas.ac.cn>