don't stop busybox build, when iproute2 is choosen

package/busybox/config/networking/Config.in

@@ -486,9 +486,8 @@ config BUSYBOX_FEATURE_IFUPDOWN_IP
 
 config BUSYBOX_FEATURE_IFUPDOWN_IP_BUILTIN
 	bool "Use busybox ip applet"
-	default y
+	default y if !BUSYBOX_DISABLE_IP
 	depends on BUSYBOX_FEATURE_IFUPDOWN_IP
-	depends on !ADK_PACKAGE_IP
 	select BUSYBOX_PLATFORM_LINUX
 	select BUSYBOX_IP
 	select BUSYBOX_FEATURE_IP_ADDRESS