mmc: Support bypass mode with the get_mmc_clk() method
Some SoCs want to adjust the input clock to the DWMMC block as a way of controlling the MMC bus clock. Update the get_mmc_clk() method to support this. Signed-off-by: NSimon Glass <sjg@chromium.org> Acked-by: NJaehoon Chung <jh80.chung@samsung.com>
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