[U-Boot] [U-Boot,v2] mkimage: fix display of image types list

[Tom Rini]

On Thu, Jun 29, 2017 at 08:37:08PM +0300, Baruch Siach wrote:

> Since commit 5b9d44df2307f (mkimage: Display a better list of available image
> types) mkimage usage text suggest to "use -T to see a list of available image
> types". Unfortunately, commit 02221f29deb8 (mkimage: Convert to use getopt())
> broke that feature, because getopt() fails when -T has no option argument.
> 
> Add a pseudo image type name 'list' that lists all image types. Update the
> usage text accordingly.
> 
> Cc: Simon Glass <sjg at chromium.org>
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>

Applied to u-boot/master, thanks!

-- 
Tom
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