lwip: fix up lwip debug macros
lwip: fix up lwip debug macros

For turning on/off debug, should use LWIP_DBG_ON/LWIP_DBG_OFF.

Change-Id: Ic4764da6eb924a80e7843b206a4ef01c2791f114
Signed-off-by: EunBong Song <1a7e7e98e070490e67aa35ab67fbf9fdda8f48ac@samsung.com>

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