[U-Boot] cmd_yaffs: Clean up command usage messages

[Tom Rini]

On Tue, Feb 03, 2015 at 10:15:04AM -0600, Peter Tyser wrote:

> Remove duplicate command names in usage messages to fix issues such as:
>   => help yls
>   yls - yaffs ls
> 
>   Usage:
>   yls yls [-l] dirname
> 
> Signed-off-by: Peter Tyser <ptyser at xes-inc.com>

Applied to u-boot/master, thanks!

-- 
Tom
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