Implement XAP 'secure' core requirements (#16843)

Co-authored-by: Drashna Jaelre <[email protected]>
Co-authored-by: Stefan Kerkmann <[email protected]>

quantum/quantum.h

@@ -200,6 +200,11 @@ extern layer_state_t layer_state;
 #    include "process_dynamic_macro.h"
 #endif
 
+#ifdef SECURE_ENABLE
+#    include "secure.h"
+#    include "process_secure.h"
+#endif
+
 #ifdef DYNAMIC_KEYMAP_ENABLE
 #    include "dynamic_keymap.h"
 #endif