[U-Boot] mmc: Staticize sd_select_bus_width

[Tom Rini]

On Sun, Apr 15, 2018 at 12:36:45AM +0200, Marek Vasut wrote:

> From: Marek Vasut <marek.vasut at gmail.com>
> 
> Staticize the function since it's only used in mmc.c .
> 
> Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
> Cc: Jaehoon Chung <jh80.chung at samsung.com>
> Cc: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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