connman: do not remove existing routes on startup

packages/network/connman/patches/connman-1.4-do-not-cleanup-routes.patch

@@ -0,0 +1,13 @@
+diff --git a/src/device.c b/src/device.c
+index 0fda950..eb09e53 100644
+--- a/src/device.c
++++ b/src/device.c
+@@ -1247,8 +1247,6 @@ int __connman_device_init(const char *device, const char *nodevice)
+ 	if (nodevice != NULL)
+ 		nodevice_filter = g_strsplit(nodevice, ",", -1);
+ 
+-	cleanup_devices();
+-
+ 	return 0;
+ }
+