packet lib: icmpv6: move ND_OPTION_* constants from classes to the module
packet lib: icmpv6: move ND_OPTION_* constants from classes to the module

the purpose is to avoid keeping the same constant values at several places.

Signed-off-by: Yuichi Ito <7a83edf5b53f0b21d4182a3da7518164ce03dc3a@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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