NNPI op mapping correct SpatialBN NNPI op name (pytorch#34176)

Summary:
Pull Request resolved: pytorch#34176

Wrong operator name for the NNPI SpatialBN

Test Plan: flow canary

Reviewed By: hyuen

Differential Revision: D20237933

fbshipit-source-id: dfde658dcbf2482320e36d549f7d83c27df264a0

caffe2/opt/custom/fakefp16_transform.cc

@@ -38,7 +38,7 @@ std::unordered_map<std::string, std::string> getFakeFp16OpMapping(
        "SparseLengthsMeanFused8BitRowwiseFakeFP16AccFP16"},
       {"BatchMatMul", "BatchMatMulFP16Acc32Fake"},
       {"Sigmoid", "SigmoidFakeFp16"},
-      {"SpatialBN", "SpatialBNFakeFp16Op"},
+      {"SpatialBN", "SpatialBNFakeFp16NNPI"},
       {"Tanh", "TanhFakeFp16"},
       {"Relu", "ReluFakeFp16"},
       {"Add", "AddFakeFp16"},