migration: Rename class type checking macros

Rename the macros to make them consistent with the MIGRATION_OBJ
macro name.

This will make future conversion to OBJECT_DECLARE* easier.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Tested-By: Roman Bolshakov <r.bolshakov@yadro.com>
Message-Id: <20200825192110.3528606-51-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

migration/migration.h

@@ -114,11 +114,11 @@ void fill_destination_postcopy_migration_info(MigrationInfo *info);
 
 #define TYPE_MIGRATION "migration"
 
-#define MIGRATION_CLASS(klass) \
+#define MIGRATION_OBJ_CLASS(klass) \
     OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION)
 #define MIGRATION_OBJ(obj) \
     OBJECT_CHECK(MigrationState, (obj), TYPE_MIGRATION)
-#define MIGRATION_GET_CLASS(obj) \
+#define MIGRATION_OBJ_GET_CLASS(obj) \
     OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION)
 
 typedef struct MigrationClass {