controllers/npad: Add accessor for current press state

Allows frontend/features to access pressed buttons conveniently as possible

src/core/hle/service/hid/hid.h

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #pragma once
+#include "core/hle/service/service.h"
 
 #include "controllers/controller_base.h"
 #include "core/hle/service/service.h"