Revert "mm: slab: enabled tracing and reapplied previous patches"

This reverts commit f01cdb900fa45b40823c1ea824e0caf9b5f2fe2b.
Revert "Revert "Some kmemleak fixes""

This reverts commit e03a633ec753edd87320036a749a45217a03ed58.
Let Dynamic Fsync build, but disable it