oliIMG

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@fbarchard can you approve the changes and run CI? Thanks.

Related to: https://github.com/google/XNNPACK/pull/6908

> note the qu8 is not used much... we are trying to move away from qu8 and use qs8 and qd8 for gemms. f32-qs8-vcvt is used alot. we may want...

@dsharlet @bhbruce could you rerun the tests and merge, I've solved the conflicts.