enable vit quantization

Summary: After 0919 nightly of pytorch vit linear layers should be quantized

Differential Revision: D49438891

Author: kimishpatel

examples/recipes/xnnpack_optimization/models.py

@@ -24,4 +24,5 @@ class OptimizationOptions(object):
     ),  # TODO[T163161310]: takes a long time to export to exec prog and save inception_v4 quantized model
     "w2l": OptimizationOptions(False, True),
     "dl3": OptimizationOptions(True, False),
+    "vit": OptimizationOptions(True, False),
 }