[U-Boot] dirvers: mmc: use __weak

[Tom Rini]

On Thu, Jul 10, 2014 at 10:46:28PM +0200, Jeroen Hofstee wrote:

> use weak instead of alias to prevent some clang warnings.
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>

Applied to u-boot/master, thanks!

-- 
Tom
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