[U-Boot] env_mmc: add error message to pass to set_default_env

[Tom Rini]

On Fri, May 08, 2015 at 02:52:09PM -0700, Tim Harvey wrote:

> Add an error message that gets passed to set_default_env() like
> env_nand implements. This message is displayed to the user as the
> reason for falling back to the default environment.
> 
> Signed-off-by: Tim Harvey <tharvey at gateworks.com>

Applied to u-boot/master, thanks!

-- 
Tom
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