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/power-sequencer/runtime_monitor.hpp b/power-sequencer/runtime_monitor.hpp
index 5a6febc..8b6789d 100644
--- a/power-sequencer/runtime_monitor.hpp
+++ b/power-sequencer/runtime_monitor.hpp
@@ -55,8 +55,7 @@
         bus(b), match(bus, getMatchString(),
                       std::bind(std::mem_fn(&RuntimeMonitor::onPowerLost), this,
                                 std::placeholders::_1))
-    {
-    }
+    {}
 
     /**
      * Clears faults and then runs DeviceMonitor::run to