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When CONFIG_$(SPL_)CLK not defined, the clock controller device not exist, so to avoid boot failure for platform not have CONFIG_$(SPL_)CLK, add a check. Reviewed-by: Patrick Wildt <patrick@blueri.se> Tested-by: Patrick Wildt <patrick@blueri.se> Signed-off-by: Peng Fan <peng.fan@nxp.com>