[$] Completing the EEVDF scheduler

The Earliest Virtual Deadline First (EEVDF)scheduler was merged as an option for the 6.6 kernel. It represents amajor change to how CPU scheduling is done on Linux systems, but the EEVDFfront has been relatively quiet since then. Now, though, schedulerdeveloper Peter Zijlstra has returned from a long absence to post a patchseries intended to finish the EEVDF work. Beyond some fixes, this workincludes a significant behavioral change and a new feature intended to helplatency-sensitive tasks.