Revert "Revert "Revert "hwrng: add randomness to system from rng sources"""

This reverts commit a01a8875b9004d9be59c51ef2cc295c454c45541.
Revert "Revert "Revert "sched: Add missing call to calc_load_exit_idle()"""

This reverts commit ad3bedc08cde200eac275624f99e5b3bcfc09a2c.