[U-Boot] mmc: add missing prototype for mmc_get_env_dev

[Tom Rini]

On Tue, Jan 26, 2016 at 04:20:38PM +0100, Clemens Gruber wrote:

> This is a follow-up patch to e92029c0f4 and adds a prototype for
> the weak mmc_get_env_dev function.
> 
> Cc: Tom Rini <trini at konsulko.com>
> Cc: Stephen Warren <swarren at nvidia.com>
> 
> Signed-off-by: Clemens Gruber <clemens.gruber at pqgruber.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>
> Reviewed-by: Peng Fan <peng.fan at nxp.com>

Applied to u-boot/master, thanks!

-- 
Tom
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