Store device's names and add more startup messages

include/drivers/serial.h

@@ -20,11 +20,17 @@
 
 #include <list.h>
 
+#ifndef SERIAL_H
+#define SERIAL_H
+
 struct serial_dev {
 	//TODO add more functions and attributes here
+	char *name;
 	int (*putc)(char);
 	struct dlist_node list;
 };
 
 int serial_register_device(struct serial_dev *sdev);
 struct serial_dev *serial_first_device();
+
+#endif /* SERIAL_H */