lwip: fix ip4_route function
lwip: fix ip4_route function

dhcp function need to send udp messages but ip4_route() assumed that
the ip address of netif shouldn't be IPADDR_ANY from the first time.
IPADDR_ANY is the default value of netif and it's changed after dhcp.

Change-Id: I646fbfa68f41d390d049b6d00dfaed88fb6001f0
Signed-off-by: bossjisu <800dec47d2987cee7cc3d7aee71bc11b56f5042e@samsung.com>

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