Remove unused visibility spec (#2594)

BUG=cl/634722988

tensorflow/lite/micro/benchmarks/BUILD

diff --git a/tensorflow/lite/micro/benchmarks/BUILD b/tensorflow/lite/micro/benchmarks/BUILD
index 808f6ac..d0f67b6 100644
--- a/tensorflow/lite/micro/benchmarks/BUILD
+++ b/tensorflow/lite/micro/benchmarks/BUILD
@@ -65,9 +65,7 @@
     hdrs = [
         "//tensorflow/lite/micro/models:generated_keyword_scrambled_8bit_model_hdr",
     ],
-    visibility = [
-        ":micro_top_level",
-    ],
+    visibility = ["//visibility:private"],
 )
 
 cc_binary(