clang updates

The openbmc CI was recently updated to clang-12 which requires some
formatting updates to the code:
https://github.com/openbmc/openbmc-build-scripts/commit/4569bf49daaebff06be0482426908bb5497fad08

Make those updates and refresh the clang-format file with the one from
docs:
https://github.com/openbmc/docs/blob/master/style/cpp/.clang-format

Change-Id: Ieb3626526373a053ec84431e7560003f229f338d
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/phosphor-regulators/src/configuration.hpp b/phosphor-regulators/src/configuration.hpp
index f0dd766..d0f7a44 100644
--- a/phosphor-regulators/src/configuration.hpp
+++ b/phosphor-regulators/src/configuration.hpp
@@ -74,8 +74,7 @@
                            std::vector<std::unique_ptr<Action>> actions) :
         volts{volts},
         actions{std::move(actions)}
-    {
-    }
+    {}
 
     /**
      * Executes the actions to configure the specified device.