Merge: arm64: AMU-based CPU frequency

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/462

JIRA: https://issues.redhat.com/browse/RHEL-80968

This is a backport of the patch series "Add support for AArch64 AMUv1-based average freq" (https://lore.kernel.org/all/20250131162439.3843071-1-beata.michalska@arm.com/

) and its dependencies.

The first patch in this MR is upstream in v6.14 (since rc3). The rest are now in Linus's master branch and slated for 6.15.

Signed-off-by: Jennifer Berringer <jberring@redhat.com>

Approved-by: David Arcari <darcari@redhat.com>
Approved-by: Mark Langsdorf <mlangsdo@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

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