Now that we have a .clang-format, use that file as reference.
Now that we have a .clang-format, use that file as reference.

Previously, we choose a particular clang-format built-in style
('Google'), but since we now have a .clang-format configuration file
use that instead to make sure we always apply the same rules.

Issues #653

Signed-off-by: Henner Zeller <259ad50fabbfd39355f36ecd6c0afca541ea66ef@acm.org>

chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible