ruby: add stdio header in SRAM.hh

missing header file caused RUBY_FS to not compile

src/mem/ruby/network/orion/Buffer/SRAM.hh

@@ -39,6 +39,7 @@
 #include "mem/ruby/network/orion/Type.hh"
 #include "mem/ruby/network/orion/OrionConfig.hh"
 #include "mem/ruby/network/orion/TechParameter.hh"
+#include <stdio.h>
 
 class OutdrvUnit;
 class AmpUnit;