Enable MV3 in xnnpack_examples (#149)

Summary:
Pull Request resolved: #149

"mv3" needs to be added to `MODEL_NAME_TO_OPTIONS` in order to run it in `xnnpack_example` or for CI to pick it up.

Reviewed By: digantdesai

Differential Revision: D48710936

fbshipit-source-id: f98cb6866880693e8a7de8482309d08f9f2991d2

Author: guangy10

examples/recipes/xnnpack_optimization/models.py

@@ -18,4 +18,5 @@ class OptimizationOptions(object):
     "add": OptimizationOptions(True, True),
     "add_mul": OptimizationOptions(True, True),
     "mv2": OptimizationOptions(True, True),
+    "mv3": OptimizationOptions(False, True),
 }