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This patch adds clk_prepare/clk_unprepare for mxs clock api by renaming the existing non-atomic clk_enable/clk_disable to clk_prepare/clk_unprepare and adding a pair of dummy clk_enable/clk_disable. Then with selecting HAVE_CLK_PREPARE for mxs clock, we can fix the mutex locking warning that has been reported for a few times. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>