packet lib: add arp constants
packet lib: add arp constants

Signed-off-by: OHMURA Kei <82a3f76f5859104098e1c763aea3695df488375c@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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