Drop all references of unused MGCP

Change-Id: I1c023d773bf196d41b4251ca7011a82969acb613
diff --git a/src/gprs/gb_proxy_vty.c b/src/gprs/gb_proxy_vty.c
index 423c582..d7d35fe 100644
--- a/src/gprs/gb_proxy_vty.c
+++ b/src/gprs/gb_proxy_vty.c
@@ -43,7 +43,7 @@
 static struct gbproxy_config *g_cfg = NULL;
 
 /*
- * vty code for mgcp below
+ * vty code for gbproxy below
  */
 static struct cmd_node gbproxy_node = {
 	GBPROXY_NODE,
@@ -855,4 +855,3 @@
 
 	return 0;
 }
-