Copy over approximately clean versions of the pvclock headers into
tools. Reconcile headers/symbols missing in tools that are unneeded.
Signed-off-by: NOliver Upton <oupton@google.com>
Message-Id: <20210916181555.973085-2-oupton@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>