Fix visibility of cc_import.bzl file

RELNOTES:none
PiperOrigin-RevId: 316680363
diff --git a/tools/build_defs/cc/BUILD b/tools/build_defs/cc/BUILD
index c0e9019..4efae59 100644
--- a/tools/build_defs/cc/BUILD
+++ b/tools/build_defs/cc/BUILD
@@ -1,6 +1,9 @@
 licenses(["notice"])  # Apache 2.0
 
-exports_files(["action_names.bzl"])
+exports_files([
+    "action_names.bzl",
+    "cc_import.bzl",
+])
 
 filegroup(
     name = "srcs",