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e1000: Revert Update intel shared code

Description

e1000: Revert Update intel shared code

This reverts commit fc7682b17f3738573099b8b03f5628dcc8148adb.

This will be done incrementally to help with bisecting an issue in
later I21x devices (ich8lan).

PR: 258153
Approved by: imp
MFC after: 1 day

(cherry picked from commit a4378873e9ce1b35b55378c21f8eae69e58c2525)