Add mbtk_source git commit info

Change-Id: I9867613657db269bba81d28c4b3712062ae41bdd
diff --git a/mbtk/libmbtk_tcpip/mbtk_tcpip_at.c b/mbtk/libmbtk_tcpip/mbtk_tcpip_at.c
index 8490ede..fadb1a6 100755
--- a/mbtk/libmbtk_tcpip/mbtk_tcpip_at.c
+++ b/mbtk/libmbtk_tcpip/mbtk_tcpip_at.c
@@ -658,3 +658,8 @@
     tcpip_link[link_id].tcpip_info.cli_info.read_cb = read_cb;
 }
 
+void mbtk_tcpip_lib_info_print()
+{
+    MBTK_SOURCE_INFO_PRINT("mbtk_tcpip_lib");
+}
+