mmc: add missing prototype for mmc_get_env_dev
This is a follow-up patch to e92029c0 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: NClemens Gruber <clemens.gruber@pqgruber.com> Reviewed-by: NTom Rini <trini@konsulko.com> Reviewed-by: NPeng Fan <peng.fan@nxp.com>
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