cpufreq: dt-platdev: add missing MODULE_DESCRIPTION() macro

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/cpufreq/cpufreq-dt-platdev.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/cpufreq-dt-platdev.c

@@ -233,4 +233,5 @@ static int __init cpufreq_dt_platdev_init(void)
 			       sizeof(struct cpufreq_dt_platform_data)));
 }
 core_initcall(cpufreq_dt_platdev_init);
+MODULE_DESCRIPTION("Generic DT based cpufreq platdev driver");
 MODULE_LICENSE("GPL");