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

This reverts commit e07561df56cf13355462f15c8000bd02070ced1a.
Revert "mutex: restrict mutex spinning to only one task per mutex"

This reverts commit e5e7525fe0bcc4eab6690b4b34fd14eba2331134.
Revert "mutex: Make more scalable by doing less atomic operations"

This reverts commit e6fa3c7731553b6c7256718909c7f174cee029c0.