Add the meshlink_get_port() and meshlink_set_port() functions.

[meshlink] / src / utcp

diff --git a/src/utcp b/src/utcp
index b570e123128f3fafa583bae186fd61429dcb49a7..a7ec88e641e14ca115fece6d1ea0e6c43144853f 160000 (submodule)
--- a/src/utcp
+++ b/src/utcp
@@ -1 +1 @@
-Subproject commit b570e123128f3fafa583bae186fd61429dcb49a7
+Subproject commit a7ec88e641e14ca115fece6d1ea0e6c43144853f