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

Tom Rini
2016-02-02T01:57:42Z

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

Applied to u-boot/master, thanks!

--
Tom
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