add more device definition.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1458 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/finsh/cmd.c

@@ -341,8 +341,13 @@ static long _list_device(struct rt_list_node *list)
 		"Block Device",
 		"Network Interface",
 		"MTD Device",
-		"CAN",
+		"CAN Device",
 		"RTC",
+		"Sound Device",
+		"Graphic Device",
+		"I2C Device",
+		"USB Slave Device",
+		"USB Host Bus",
 		"Unknown"
 	};