qemu: add QEMU_CAPS_DEVICE_SCLPLMCONSOLE
Add a separate capability for the sclplmconsole device, and check it
specifically instead of using QEMU_CAPS_DEVICE_SCLPCONSOLE for that too.
Signed-off-by: Pino Toscano <ptoscano@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>