Revert "Remove deprecated fbgemm operators (#104535)"

This reverts commit 57c7aa12dbf71617bd21fe7e076df8e823b5b7bb.

Reverted https://github.com/pytorch/pytorch/pull/104535 on behalf of https://github.com/facebook-github-bot due to Diff reverted internally ([comment](https://github.com/pytorch/pytorch/pull/104535#issuecomment-1779650412))
diff --git a/build_variables.bzl b/build_variables.bzl
index 11152d6..2a306c2 100644
--- a/build_variables.bzl
+++ b/build_variables.bzl
@@ -1323,6 +1323,7 @@
     "aten/src/ATen/native/PointwiseOps.cpp",
     "aten/src/ATen/native/Pooling.cpp",
     "aten/src/ATen/native/Pow.cpp",
+    "aten/src/ATen/native/QuantizedLinear.cpp",
     "aten/src/ATen/native/RNN.cpp",
     "aten/src/ATen/native/RangeFactories.cpp",
     "aten/src/ATen/native/ReduceAllOps.cpp",