Revert "Revert "Revert "workqueue: restructure pool / pool_workqueue iterations in freeze/thaw functions"""

This reverts commit efe698f6d2e093c2ea6e757a660f797b5d0e7208.
Revert "Revert "Revert "workqueue: introduce for_each_pool()"""

This reverts commit b4d19afdcf5673072943b76acf0b36d279d45cad.