NUC123 add early_init to allow build of projects that need it to be defined

os/hal/boards/NUTINY-SDK-NUC123-V2.0/board.c

@@ -29,3 +29,12 @@ void boardInit(void)
   OnboardLED_Init();
 #endif
 }
+
+/**
+ * @brief   Early initialization code.
+ * @details This initialization is performed just after reset before BSS and
+ *          DATA segments initialization.
+ */
+void __early_init(void)
+{
+}