Update kep status and toc

Author: Jeffwan

keps/sig-node/4176-cpumanager-spread-cpus-preferred-policy/README.md

@@ -80,9 +80,8 @@ tags, and then generate with `hack/update-toc.sh`.
 <!-- toc -->
 - [Release Signoff Checklist](#release-signoff-checklist)
 - [Summary](#summary)
-- [Motivation](#motivation)
-  - [Goals](#goals)
-  - [Non-Goals](#non-goals)
+- [Goals](#goals)
+- [Non-Goals](#non-goals)
 - [Proposal](#proposal)
   - [User Stories (Optional)](#user-stories-optional)
     - [Story 1 Bytedance Database Performance Optimization](#story-1-bytedance-database-performance-optimization)

keps/sig-node/4176-cpumanager-spread-cpus-preferred-policy/kep.yaml

@@ -7,7 +7,7 @@ authors:
   - "@LastNight1997"
 owning-sig: sig-node
 participating-sigs: []
-status: provisional
+status: implementable
 creation-date: "2023-09-04"
 reviewers:
   - "@ffromani"