[U-Boot] common: env_mmc: Use __weak annotation to simplify code

[Tom Rini]

On Tue, Jan 08, 2013 at 05:36:11AM -0000, Fabio Estevam wrote:

> Using the __weak annotation can make the code cleaner.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> Acked-by: Marek Vasut <marex at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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