packet lib: fix vlan pcp bitshift
packet lib: fix vlan pcp bitshift

Signed-off-by: HIYAMA Manabu <ca8e8d5cce4616c953c505dbe74ba563fd9d95e0@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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