Merge: KVM: backport improvements to dirty_log_test

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6549

Backport a series of improvements to dirty_log_test that make this test more
robust, and in particular make it work in L1

Also backport a minor fix to KVM which needs to be present in L1 kernel to avoid the test failing,
when run on Intel.

JIRA: https://issues.redhat.com/browse/RHEL-67879



Tested: run the test few times

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>

Approved-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Approved-by: Cathy Avery <cavery@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Augusto Caringi <acaringi@redhat.com>