cpufreq: dt: Allow platform specific suspend/resume callbacks

Platforms may need to implement platform specific suspend/resume hooks.
Update cpufreq-dt driver's platform data to contain those for such
platforms.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq-dt.h

@@ -12,8 +12,13 @@
 
 #include <linux/types.h>
 
+struct cpufreq_policy;
+
 struct cpufreq_dt_platform_data {
 	bool have_governor_per_policy;
+
+	int (*suspend)(struct cpufreq_policy *policy);
+	int (*resume)(struct cpufreq_policy *policy);
 };
 
 #endif /* __CPUFREQ_DT_H__ */