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/journal.cpp b/phosphor-regulators/src/journal.cpp
index ba9d846..eed5a70 100644
--- a/phosphor-regulators/src/journal.cpp
+++ b/phosphor-regulators/src/journal.cpp
@@ -44,8 +44,7 @@
     JournalCloser& operator=(JournalCloser&&) = delete;
 
     JournalCloser(sd_journal* journal) : journal{journal}
-    {
-    }
+    {}
 
     ~JournalCloser()
     {