Cfu s8s8 (#10413)
Adding S8S8 kernels for symmetric quantized indirect conv and depthwise conv.
Perf number with single thread:
Nokia G10 (baseline / new) in ms Pixel 4 (baseline/new) in ms
mobilenet_edgetpu 220 / 213 18.5 / 17.6
cartoongan 8537 / 8521 967 / 928
Co-authored-by: Chen Fu <fuchen@microsoft.com>
