migration: Move migration.h to migration/

Nothing uses it outside of migration.h

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
diff --git a/tests/test-vmstate.c b/tests/test-vmstate.c
index f30433a..ee292c7 100644
--- a/tests/test-vmstate.c
+++ b/tests/test-vmstate.c
@@ -25,7 +25,7 @@
 #include "qemu/osdep.h"
 
 #include "qemu-common.h"
-#include "migration/migration.h"
+#include "../migration/migration.h"
 #include "migration/vmstate.h"
 #include "migration/qemu-file-types.h"
 #include "../migration/qemu-file.h"