Standardize command usage messages with cmd_usage()

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/esd/common/lcd.c b/board/esd/common/lcd.c
index 1eea59e..1db8d90 100644
--- a/board/esd/common/lcd.c
+++ b/board/esd/common/lcd.c
@@ -346,7 +346,7 @@
 	char *str;
 #endif
 	if (argc != 2) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}