Make conv_linker_config visible to linkerconfig

linkerconfig_diff_test uses conv_linker_config.

Bug: 276890767
Test: atest --host linkerconfig_diff_test
Change-Id: I2f669b83f24b9dd563fc034738fe4ba83f95fd49
diff --git a/scripts/Android.bp b/scripts/Android.bp
index 26fe432..9367ff0 100644
--- a/scripts/Android.bp
+++ b/scripts/Android.bp
@@ -189,6 +189,7 @@
     libs: [
         "linker_config_proto",
     ],
+    visibility: ["//system/linkerconfig"],
 }
 
 python_test_host {