Format gd/neighbor with new clang-format

find neighbor -regex '.*\.\(cc\|h\|tpp\)' -exec clang-format -style=file -i {} \;

Test: cert/run --host
Bug: 156858180
Tag: #gd-refactor
Change-Id: Iac2361e60bc15e2de3496f1e6fb9f253b6c284d7