[U-Boot] watchdog: Fix Kconfig alignment for WDT_SANDBOX

[Tom Rini]

On Wed, Mar 28, 2018 at 12:57:54PM +0200, Michal Simek wrote:

> Fix Kconfig alignment which should be <tab><space><space>.
> 
> Signed-off-by: Michal Simek <michal.simek at xilinx.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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