bearer-mbim: Disable multiplex support for wwan devices

WWAN network devices expose link management over netlink (wwan type),
but it is not yet supported by libmbim.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>

src/mm-bearer-mbim.c

@@ -1176,6 +1176,9 @@ load_settings_from_bearer (MMBearerMbim        *self,
     if (!g_strcmp0 (data_port_driver, "mhi_net"))
         multiplex_supported = FALSE;
 
+    if (mm_kernel_device_get_wwandev_sysfs_path (mm_port_peek_kernel_device (ctx->data)))
+        multiplex_supported = FALSE;
+
     /* If no multiplex setting given by the user, assume default */
     multiplex = mm_bearer_properties_get_multiplex (properties);
     if (multiplex == MM_BEARER_MULTIPLEX_SUPPORT_UNKNOWN)