Revert "sched: Unthrottle rt runqueues in __disable_runtime()"

This reverts commit 42c6868ca48801d965aba40d4058cbacd803b72c.
Revert "sched/rt: fix SCHED_RR across cgroups"

This reverts commit 2eec7c9f3f20cf720ac8a97e23a2954132c025c9.
Revert "timekeeping: fix 32-bit overflow in get_monotonic_boottime"

This reverts commit 097431be69a79666bc20a1e94aa34740b9c9cdd5.
3.4.80
3.4.81rc