ggml : remove invalid portPos specifiers from dot files (#14838) Neither "g" nor "x" are valid portPos specifiers per the official [graphviz documents](https://graphviz.org/docs/attr-types/portPos/): > If a compass point is used, it must have the form "n","ne","e","se","s","sw","w","nw","c","_". I tested locally for it to fall back to default portPos specifier if an invalid portPos is specified. As a consequence, we can remove associated code.