update clang-format

This commit would update the repo's clang-format file to
the latest of docs/style/cpp/clang-format file.

Following is the new change that is added:
Brad :
  clang-format: cpp: remove empty lines

Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
Change-Id: Ieaadd8a1cd779c9c12adf6d065cc1f9e9a8fa37b