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According to the eMMC specification, in Backwards Compatibility with legacy MMC card mode, the frequency of the SD clock must be 0-26 MHZ; in high speed SDR mode, it must be 0-52MHZ. So we should switch to high speed SDR mode if the clock frequency is higher than 26MHZ. Signed-off-by: Yinzhe Wu <Yinzhe.Wu@sony.com> Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com> Reviewed-by: Jacky Cao <Jacky.Cao@sony.com> Tested-by: Yinzhe Wu <Yinzhe.Wu@sony.com>