Fix Dynamic QLinear with new XNNPACK Version (#1373)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/1373

Without Digants patches due to new xnnpack commit, we need to rewire XNNPACK delegate to support old DQ Linear path. which is from dq-datatype.
The diff stack this contains is from D51878934 to D51927294. Those diffs are seperated for the sake of reviewability, but all changes are required in order
for CI to properly pass. This diff should actually be merged with the diff preceding it, but because ghexport does not work on both PyTorch and ExecuTorch
repo and the diff is too large to get the phabricator button, seperate in order to export for ExecuTorch and for PyTorch

allow-large-files

Reviewed By: digantdesai

Differential Revision: D51955472

fbshipit-source-id: 3510fff93c9d3e36cdff98265cf282f6dc9f4693