drop struct keyword for non-packed objects

As a style decision, struct is often used with packed structures to
indicate they are used like C-structs.  Cleanup this codebase to not use
the extra struct keyword throughout.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I2f83bb1989e4d1f2f843ba3e45fb82e04f0fa61c
diff --git a/pid/builder.hpp b/pid/builder.hpp
index c07de74..5f03400 100644
--- a/pid/builder.hpp
+++ b/pid/builder.hpp
@@ -14,7 +14,7 @@
 
 std::unordered_map<int64_t, std::shared_ptr<ZoneInterface>>
     buildZones(const std::map<int64_t, conf::PIDConf>& zonePids,
-               std::map<int64_t, struct conf::ZoneConfig>& zoneConfigs,
+               std::map<int64_t, conf::ZoneConfig>& zoneConfigs,
                SensorManager& mgr, sdbusplus::bus::bus& modeControlBus);
 
 }