Revert "Ported mako 3.4 kernel workqueue"

This reverts commit ba78220d0136d2f776d5f4e5511f0770b1d5e2fe.
Revert "Bring workqueue.h to same upstream version as workqueue.c"

This reverts commit c37c195af8ed7eb4601a23f1a19dd8da3cb0c026.