[U-Boot] configs: Fix mmc rescan misuses

[Tom Rini]

On Tue, Aug 02, 2016 at 10:36:17AM +0000, Karl Beldan wrote:

> This follows 9fd383724cf4 ("mmc: don't allow extra cmdline arguments"),
> and affects omapl138_lcdk and omap3_evm_quick_mmc.
> 
> Signed-off-by: Karl Beldan <kbeldan at baylibre.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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