plugins: add MM_PLUGIN_REQUIRED_QCDM to plugins requiring QCDM

The new QCDM port probing and grabbing mechanism implements a new
property for detecting the plugins which require the QCDM port to
be probed and grabbed.

Add the property to the affected plugins.

plugins/novatel/mm-plugin-novatel.c

@@ -94,7 +94,7 @@ mm_plugin_create (void)
                       MM_PLUGIN_FORBIDDEN_PRODUCT_IDS, forbidden_products,
                       MM_PLUGIN_ALLOWED_AT,            TRUE,
                       MM_PLUGIN_CUSTOM_INIT,           &custom_init,
-                      MM_PLUGIN_ALLOWED_QCDM,          TRUE,
+                      MM_PLUGIN_REQUIRED_QCDM,         TRUE,
                       MM_PLUGIN_ALLOWED_QMI,           TRUE,
                       NULL));
 }