net/lwip: rebuild NA message handling
net/lwip: rebuild NA message handling

This patch fixes the NA message handling routine.
It was not designed in according to RFC4861

Change-Id: Ia737a16a9b76105d550515df0d96e36dbb68a71f
Signed-off-by: jisuu.kim <800dec47d2987cee7cc3d7aee71bc11b56f5042e@samsung.com>

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