ggml-cpu: fix SVE leftover path in ggml_vec_dot_f32 (#24699)
* ggml-cpu: fix SVE leftover path in ggml_vec_dot_f32
2D convolutions with kernel size 9 produced different results on SVE
enabled ARM devices. After debugging it turned out that ggml_vec_dot_f32
was using data from inactive lanes.
Use svmla_f32_m(pg, sum1, ax1, ay1) so inactive lanes retain sum1.
* cont : clean-up
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
