mmc: sdhci-esdhc-imx: add runtime pm support
The root clock will be disabled in runtime pm to save power. Signed-off-by: NDong Aisheng <b29396@freescale.com> Acked-by: NUlf Hansson <ulf.hansson@linaro.org> Signed-off-by: NChris Ball <cjb@laptop.org>
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