s390x/ipl: sort into categories

The s390 ipl device has no real home (it's not really a storage device),
so let's sort it into the misc category.
Reviewed-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/ipl.c

@@ -315,6 +315,7 @@ static void s390_ipl_class_init(ObjectClass *klass, void *data)
     dc->props = s390_ipl_properties;
     dc->reset = s390_ipl_reset;
     dc->vmsd = &vmstate_ipl;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 }
 
 static const TypeInfo s390_ipl_info = {