[U-Boot] common: console: Fix duplicated CONFIG in silent env callback

[Tom Rini]

On Fri, Aug 25, 2017 at 12:06:29AM -0700, Wilson Lee wrote:

> The silent environment callback function does not update the silent
> flag during silent env set or unset. That is because of duplicated
> CONFIG keyword at preprocessor condition in silent environment
> callback function and cause silent env callback unable to work.
> 
> This patch is to remove the duplicated CONFIG keywork in silent
> environment callback function.
> 
> Signed-off-by: Wilson Lee <wilson.lee at ni.com>
> Cc: Keng Soon Cheah <keng.soon.cheah at ni.com>
> Cc: Chen Yee Chew <chen.yee.chew at ni.com>
> Cc: Joe Hershberger <joe.hershberger at ni.com>

Applied to u-boot/master, thanks!

-- 
Tom
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