Ruby: Shuffle some of the included files

This patch adds and removes included files from some of the files so as to
organize remove some false dependencies and include some files directly
instead of transitively.

--HG--
extra : rebase_source : 09b482ee9ae00b3a204ace0c63550bc3ca220134

src/mem/ruby/network/simple/Throttle.cc

@@ -28,6 +28,7 @@
 
 #include <cassert>
 
+#include "base/cast.hh"
 #include "base/cprintf.hh"
 #include "debug/RubyNetwork.hh"
 #include "mem/ruby/buffers/MessageBuffer.hh"