Fix `MobileViTV2` checkpoint name (#24018)

* fix

* fix

* Apply suggestions from code review
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

---------
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

tests/models/mobilevitv2/test_modeling_mobilevitv2.py

@@ -306,14 +306,14 @@ class MobileViTV2ModelIntegrationTest(unittest.TestCase):
     @cached_property
     def default_image_processor(self):
         return (
-            MobileViTImageProcessor.from_pretrained("shehan97/mobilevitv2-1.0-imagenet1k-256")
+            MobileViTImageProcessor.from_pretrained("apple/mobilevitv2-1.0-imagenet1k-256")
             if is_vision_available()
             else None
         )
 
     @slow
     def test_inference_image_classification_head(self):
-        model = MobileViTV2ForImageClassification.from_pretrained("shehan97/mobilevitv2-1.0-imagenet1k-256").to(
+        model = MobileViTV2ForImageClassification.from_pretrained("apple/mobilevitv2-1.0-imagenet1k-256").to(
             torch_device
         )