add BoxWithNMSLimit_out to DSP as a custom portable op

Differential Revision: D72275947

Pull Request resolved: #10157

Author: zonglinpeng

runtime/core/portable_type/c10/c10/targets.bzl

@@ -39,6 +39,7 @@ def define_common_targets():
         ]),
         visibility = [
             "//executorch/...",
+            "@EXECUTORCH_CLIENTS",
         ],
         deps = select({
             "DEFAULT": [],