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Revert "pst: improve shutdown_post_sync handler"

Description

Revert "pst: improve shutdown_post_sync handler"

I did not realize this driver was i386-only, and the change fails to
compile. Revert so that I can fix it properly.

This reverts commit 428ebb7cd9f51afb6809bf81cf21a05e0fd93ff4.

Pointy hat to: mhorne