create //c10/cuda library (#70863)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70863

ghstack-source-id: 148159368

Test Plan: Ought to be a no-op: rely on CI to validate.

Reviewed By: malfet

Differential Revision: D33367290

fbshipit-source-id: cb550538b9eafaa0117f94077ebd4cb920688881
(cherry picked from commit 077d9578bcbf5e41e806c6acb7a8f7c622f66fe9)

tools/bazel.bzl

@@ -1,4 +1,5 @@
 load("@rules_cc//cc:defs.bzl", "cc_library")
+load("@rules_cuda//cuda:defs.bzl", "requires_cuda_enabled")
 load("//c10/macros:cmake_configure_file.bzl", "cmake_configure_file")
 
 # Rules implementation for the Bazel build system. Since the common
@@ -9,5 +10,6 @@ rules = struct(
     cmake_configure_file = cmake_configure_file,
     filegroup = native.filegroup,
     glob = native.glob,
+    requires_cuda_enabled = requires_cuda_enabled,
     select = select,
 )