migration: Add support for modules

So we don't have to compile everything in, or have ifdefs

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

softmmu/vl.c

@@ -2858,6 +2858,7 @@ void qemu_init(int argc, char **argv, char **envp)
     qemu_init_exec_dir(argv[0]);
 
     module_call_init(MODULE_INIT_QOM);
+    module_call_init(MODULE_INIT_MIGRATION);
 
     qemu_add_opts(&qemu_drive_opts);
     qemu_add_drive_opts(&qemu_legacy_drive_opts);