Add GenerateI8Depthwise.cc to bazel build definition of fbgemm (#36144)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/36144
Differential Revision: D20894322
Pulled By: malfet
fbshipit-source-id: 306702d4c6e2c79fef2345b0befd101d0a9317bf
