Move QOM typedefs and add missing includes

Some typedefs and macros are defined after the type check macros.
This makes it difficult to automatically replace their
definitions with OBJECT_DECLARE_TYPE.

Patch generated using:

 $ ./scripts/codeconverter/converter.py -i \
   --pattern=QOMStructTypedefSplit $(git grep -l '' -- '*.[ch]')

which will split "typdef struct { ... } TypedefName"
declarations.

Followed by:

 $ ./scripts/codeconverter/converter.py -i --pattern=MoveSymbols \
    $(git grep -l '' -- '*.[ch]')

which will:
- move the typedefs and #defines above the type check macros
- add missing #include "qom/object.h" lines if necessary

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20200831210740.126168-9-ehabkost@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20200831210740.126168-10-ehabkost@redhat.com>
Message-Id: <20200831210740.126168-11-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

migration/migration.h

@@ -21,6 +21,7 @@
 #include "qemu/coroutine_int.h"
 #include "io/channel.h"
 #include "net/announce.h"
+#include "qom/object.h"
 
 struct PostcopyBlocktimeContext;
 
@@ -114,6 +115,7 @@ void fill_destination_postcopy_migration_info(MigrationInfo *info);
 
 #define TYPE_MIGRATION "migration"
 
+typedef struct MigrationClass MigrationClass;
 #define MIGRATION_OBJ_CLASS(klass) \
     OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION)
 #define MIGRATION_OBJ(obj) \
@@ -121,10 +123,10 @@ void fill_destination_postcopy_migration_info(MigrationInfo *info);
 #define MIGRATION_OBJ_GET_CLASS(obj) \
     OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION)
 
-typedef struct MigrationClass {
+struct MigrationClass {
     /*< private >*/
     DeviceClass parent_class;
-} MigrationClass;
+};
 
 struct MigrationState
 {