tcpdump: allow vendor access on userdebug builds.

Bug: 111243627
Test: m selinux_policy
Change-Id: I0bab79d1a3b7a8b5bf5d12ba2dc5ce46abea5332

public/domain.te

@@ -1085,6 +1085,7 @@ full_treble_only(`
         -vendor_file_type
         -crash_dump_exec
         -netutils_wrapper_exec
+        userdebug_or_eng(`-tcpdump_exec')
     }:file { entrypoint execute execute_no_trans };
 ')