move Bazel //:tools_autograd to the //tools/autograd package (#74745)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74745

This is to be consistent with internal builds.
ghstack-source-id: 152722873

Test Plan: Rely on CI.

Reviewed By: ezyang

Differential Revision: D35144475

fbshipit-source-id: f4cea54ceb05cd70de76c7a679466c92d063d15e
(cherry picked from commit a52691384ad6773cf6e7ebbb5709a4d2696875e8)

BUILD.bazel

@@ -95,16 +95,6 @@ generate_aten(
     generator = "//tools/codegen:gen",
 )
 
-py_library(
-    name = "tools_autograd",
-    srcs = glob(["tools/autograd/*.py"]),
-    data = glob([
-        "tools/autograd/*.yaml",
-        "tools/autograd/templates/*",
-    ]),
-    deps = ["//tools/codegen"],
-)
-
 py_library(
     name = "tools_jit",
     srcs = glob(["tools/jit/*.py"]),
@@ -115,8 +105,8 @@ py_binary(
     name = "generate_code",
     srcs = ["tools/setup_helpers/generate_code.py"],
     deps = [
-        ":tools_autograd",
         ":tools_jit",
+        "//tools/autograd",
     ],
 )
 

tools/autograd/BUILD.bazel

@@ -0,0 +1,10 @@
+py_library(
+    name = "autograd",
+    srcs = glob(["*.py"]),
+    data = glob([
+        "*.yaml",
+        "templates/*",
+    ]),
+    visibility = ["//:__subpackages__"],
+    deps = ["//tools/codegen"],
+)