checkpatch: Update check of link tags

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8JC6Z



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Custom 'bugzilla' and 'Reference' tags can also be URL, update the check
of link tags.

Signed-off-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>