enable ntpd client as default

package/busybox/config/networking/Config.in

@@ -748,7 +748,7 @@ config BUSYBOX_NSLOOKUP
 config BUSYBOX_NTPD
 	bool "ntpd"
 	depends on !ADK_PACKAGE_OPENNTPD
-	default n
+	default y
 	select BUSYBOX_PLATFORM_LINUX
 	help
 	  The NTP client/server daemon.