Revert "mutex: dynamically disable mutex spinning at high load Date"

This reverts commit c3c78e320821919a15cf48afb9bcf36494df812c.
Revert "mutex: restrict mutex spinning to only one task per mutex"

This reverts commit 9e0e7f657f16eb6a6ca6c806bdbed79aff0cc032.
Revert "mutex: Make more scalable by doing less atomic operations"

This reverts commit 87233484555825a5a8431bcec1d51c893126fa66.