Restore build_config not exposing has_tag

Author: alekstheod

xla/tsl/platform/build_config_root.bzl

@@ -25,7 +25,6 @@ load(
     _tf_cuda_tests_tags = "tf_cuda_tests_tags",
     _tf_exec_properties = "tf_exec_properties",
     _tf_gpu_tests_tags = "tf_gpu_tests_tags",
-    _tf_has_tag = "tf_has_tag",
 )
 
 visibility(DEFAULT_LOAD_VISIBILITY + LEGACY_TSL_PLATFORM_BUILD_CONFIG_ROOT_USERS)
@@ -48,4 +47,3 @@ tf_additional_xla_deps_py = _tf_additional_xla_deps_py
 tf_cuda_tests_tags = _tf_cuda_tests_tags
 tf_exec_properties = _tf_exec_properties
 tf_gpu_tests_tags = _tf_gpu_tests_tags
-tf_has_tag = _tf_has_tag