Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/tqc/tqm5200/cmd_tb5200.c b/board/tqc/tqm5200/cmd_tb5200.c
index 214dca6..b9c9e7e 100644
--- a/board/tqc/tqm5200/cmd_tb5200.c
+++ b/board/tqc/tqm5200/cmd_tb5200.c
@@ -90,13 +90,13 @@
 
 U_BOOT_CMD(
 	led ,	2,	1,	cmd_led,
-	"led     - switch status LED on or off\n",
+	"switch status LED on or off",
 	"on/off\n"
 );
 
 U_BOOT_CMD(
 	backlight ,	2,	1,	cmd_backlight,
-	"backlight - switch backlight on or off\n",
+	"switch backlight on or off",
 	"on/off\n"
 	);