[U-Boot] MAKEALL: Fix case substitution for old bash

[Tom Rini]

On Fri, Mar 22, 2013 at 07:37:03AM -0000, York Sun wrote:

> Bash ver 3.x doesn't support the parameter expansion with case
> substitution. Use tr instead.
> 
> Signed-off-by: York Sun <yorksun at freescale.com>
> Acked-by: Allen Martin <amartin at nvidia.com>

Applied to u-boot/master, thanks!

-- 
Tom
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