Merge: Sched: /proc/schedstat improvements

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/411

JIRA: https://issues.redhat.com/browse/RHEL-24185



Update /proc/schedstat with fixes and improved information
from upstream.  AMD requested these and they don't carry
a large risk.

Signed-off-by: Phil Auld <pauld@redhat.com>

Approved-by: Juri Lelli <juri.lelli@redhat.com>
Approved-by: Waiman Long <longman@redhat.com>
Approved-by: Rafael Aquini <raquini@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Julio Faracco <jfaracco@redhat.com>