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-power-supply/psu_manager.cpp b/phosphor-power-supply/psu_manager.cpp
index 93d1415..603c0ef 100644
--- a/phosphor-power-supply/psu_manager.cpp
+++ b/phosphor-power-supply/psu_manager.cpp
@@ -126,8 +126,7 @@
             }
         }
         catch (std::exception& e)
-        {
-        }
+        {}
     }
 
     if ((i2cbus) && (i2caddr) && (psuname) && (!psuname->empty()))
@@ -223,8 +222,7 @@
         supportedConfigs.emplace(*model, sys);
     }
     catch (std::exception& e)
-    {
-    }
+    {}
 }
 
 void PSUManager::getSystemProperties()