s390x: Introduce a SCLPDevice pointer under the machine

Initialize directly SCLPDevice from the machine init handler and
remove s390_sclp_init(). We will use the SCLPDevice pointer later to
create the consoles.

Signed-off-by: Cédric Le Goater <clg@redhat.com>
Message-ID: <20240502131533.377719-2-clg@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
4 files changed