[U-Boot] patman: refactor help message

[Tom Rini]

On Thu, Aug 21, 2014 at 02:28:03PM +0900, Masahiro Yamada wrote:

> "patman [options]" is displayed by default.
> 
> Append the rest of help messages to parser.usage
> instead of replacing it.
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>

Applied to u-boot/master, thanks!

-- 
Tom
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