thermal: cpu_cooling: add needed header for cpu_cooling.h

Update header list for cpu_cooling.h. Missing definition of cpumask.
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Acked-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

include/linux/cpu_cooling.h

@@ -25,6 +25,7 @@
 #define __CPU_COOLING_H__
 
 #include <linux/thermal.h>
+#include <linux/cpumask.h>
 
 #define CPUFREQ_COOLING_START		0
 #define CPUFREQ_COOLING_STOP		1