Add housekeeping task callbacks so that keyboards/keymaps are capable of executing code for each main loop iteration. (#10530)

tmk_core/protocol/lufa/lufa.c

@@ -1104,6 +1104,10 @@ int main(void) {
 #if !defined(INTERRUPT_CONTROL_ENDPOINT)
         USB_USBTask();
 #endif
+
+        // Run housekeeping
+        housekeeping_task_kb();
+        housekeeping_task_user();
     }
 }