cpufreq: sti: add missing MODULE_DEVICE_TABLE entry for stih418
'st,stih418' is missing in the compatible list.
Add it in order to use the driver with stih418 platform.
Signed-off-by: Raphael Gallais-Pou <rgallaispou@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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