fusee_cpp: implement SDRAM initialization

fusee_cpp/program/source/fusee_main.cpp

@@ -15,6 +15,7 @@
  */
 #include <exosphere.hpp>
 #include "fusee_secure_initialize.hpp"
+#include "fusee_sdram.hpp"
 
 namespace ams::nxboot {
 
@@ -22,6 +23,9 @@ namespace ams::nxboot {
         /* Perform secure hardware initialization. */
         SecureInitialize(true);
 
+        /* Initialize Sdram. */
+        InitializeSdram();
+
         /* TODO */
         AMS_INFINITE_LOOP();
     }