s390x: add missing sclp definitions from QEMU

Copy all missing definitions from QEMU (include/hw/s390x/sclp.h).
We cannot simply replace the file, as some ASCII definitions are missing
in the QEMU file (defined somewhere else in QEMU).

Convert QEMU_PACKED accordingly and copy the copyright statement.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180213162321.20522-5-david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>