Untangle and clean up the logging code

It was a mess before because of a combination of having code split out
for cRIO vs Linux and cruft.

Change-Id: Id282e1a7f7988be0441c669a573a5d022ed41fb9
diff --git a/aos/linux_code/dump_rtprio.cc b/aos/linux_code/dump_rtprio.cc
index cae69f1..2bfb9c1 100644
--- a/aos/linux_code/dump_rtprio.cc
+++ b/aos/linux_code/dump_rtprio.cc
@@ -17,7 +17,7 @@
 #include <string>
 
 #include "aos/common/logging/logging.h"
-#include "aos/common/logging/logging_impl.h"
+#include "aos/common/logging/implementations.h"
 #include "aos/common/time.h"
 
 namespace {