hle: Add proper type for result code

This should clean up all HLE errorcode in the codebase.

I didn't removed Rust::Result as this should be a cleanup for another
iteration.

include/result/result_gsp.hpp

@@ -0,0 +1,8 @@
+#pragma once
+#include "result_common.hpp"
+
+DEFINE_HORIZON_RESULT_MODULE(Result::GSP, GSP);
+
+namespace Result::GSP {
+    DEFINE_HORIZON_RESULT(SuccessRegisterIRQ, 519, Success, Success);
+};