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/conf.hpp b/conf.hpp
index f2157e1..e471f22 100644
--- a/conf.hpp
+++ b/conf.hpp
@@ -58,7 +58,7 @@
     double failsafePercent;
 };
 
-using PIDConf = std::map<std::string, struct ControllerInfo>;
+using PIDConf = std::map<std::string, ControllerInfo>;
 
 constexpr bool DEBUG = false; // enable to print found configuration