Add MViT (Multi-Scale) V2

Author: rwightman

timm/models/__init__.py

@@ -28,6 +28,7 @@
 from .mlp_mixer import *
 from .mobilenetv3 import *
 from .mobilevit import *
+from .mvitv2 import *
 from .nasnet import *
 from .nest import *
 from .nfnet import *