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/test/power_supply_tests.cpp b/phosphor-power-supply/test/power_supply_tests.cpp
index b298d6c..19d5203 100644
--- a/phosphor-power-supply/test/power_supply_tests.cpp
+++ b/phosphor-power-supply/test/power_supply_tests.cpp
@@ -251,8 +251,7 @@
         psu.onOffConfig(data);
     }
     catch (...)
-    {
-    }
+    {}
 
     // Test where PSU is present
     try
@@ -273,8 +272,7 @@
         psu.onOffConfig(data);
     }
     catch (...)
-    {
-    }
+    {}
 }
 
 TEST_F(PowerSupplyTests, ClearFaults)