plugins: Fix port enums includes

The `broadmobi`, `dlink`, `telit` and `tplink` plugins include the
`mm-port-enums-types.h` header. However, they do not use any symbol
defined there.

The `huawei` plugin as includes the `mm-port-enums-types.h` header
but it does not include the build targets as dependencies.

These issues have been fixed by removing the unnecessary includes
from `broadmobi`, `dlink`, `telit` and `tplink` plugins and by
including the enums build target in the `huawei` target.

plugins/telit/mm-plugin-telit.c

@@ -21,7 +21,6 @@
 #define _LIBMM_INSIDE_MM
 #include <libmm-glib.h>
 
-#include "mm-port-enums-types.h"
 #include "mm-log-object.h"
 #include "mm-modem-helpers.h"
 #include "mm-plugin-telit.h"