mmc: sdhci: add a voltage switch callback function
This patch adds a callback function to do controller-specific actions when switching voltages. It is a preparation and will be used by Fujitsu SDHCI controller f_sdh30 driver. Signed-off-by: NVincent Yang <Vincent.Yang@tw.fujitsu.com> Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
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