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/error_logging.hpp b/phosphor-regulators/src/error_logging.hpp
index e6abfbe..1468604 100644
--- a/phosphor-regulators/src/error_logging.hpp
+++ b/phosphor-regulators/src/error_logging.hpp
@@ -167,8 +167,7 @@
      * @param bus D-Bus bus object
      */
     explicit DBusErrorLogging(sdbusplus::bus::bus& bus) : bus{bus}
-    {
-    }
+    {}
 
     /** @copydoc ErrorLogging::logConfigFileError() */
     virtual void logConfigFileError(Entry::Level severity,