clk: ux500: Support is_prepared callback for clk-prcmu
To be able to gate unused prcmu clocks from the clk_disable_unused sequence, clk-prcmu now implements the is_prepared callback. Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org> Signed-off-by: NMike Turquette <mturquette@linaro.org>
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