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When calculating the MMC phase we can just use clk_hw_get_rate()
instead of clk_get_rate().  This avoids recalculating the rate.
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>