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sched/alt: Implement missing CPU files stubs for cgroups v1 and v2

Steven Barrett requested to merge (removed):linux-6.5.y-prjc-cpu-files-stubs into linux-6.5.y-prjc

Create stubs for all the missing entries in cpu_files and cpu_legacy_files so that container orchestration techologies like Kubernetes and Pterodactyl initialize and operate without errors.

Also fix two issues in cpu_cgrp_subsys declaration:

  1. Remove redundant entry for legacy_cftypes (syncs with mainline)
  2. Add a stub for cpu_local_stat_show for applications that may blindly invoke it

This MR does not completely sync with mainline the Kconfig dependencies for CONFIG_CFS_BANDWIDTH, CONFIG_RT_GROUP_SCHED, and CONFIG_UCLAMP_TASK_GROUP. If an application is found that needs those defined in the kernel configuration, I can open another MR to fix that as well.

Related issue: #51 (closed)

Edited by Steven Barrett

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