Add RepViT models

Author: jameslahm

timm/models/__init__.py

@@ -40,6 +40,7 @@
 from .pnasnet import *
 from .pvt_v2 import *
 from .regnet import *
+from .repvit import *
 from .res2net import *
 from .resnest import *
 from .resnet import *