[caffe2] Fix include of corresponding header
Summary:
AFAICT, this include was a typo, and meant to be the corresponding
header for this .cpp, but instead pulled in an unrelated header.
Test Plan: CI
Reviewed By: igorsugak
Differential Revision: D29422993
fbshipit-source-id: cc9bb29ee1f1007b68c6666ea8e389f6f39928af
