ENGR00221197-1 imx6 thermal: clear thermal hot variable in cooling device

clear thermal hot variable in cooling device when thermal temperature
falls then to get out of THERMAL_TRIP_HOT state
Signed-off-by: Rong Dian <b38775@freescale.com>

drivers/mxc/thermal/cooling.c

@@ -57,6 +57,7 @@ cpufreq, it minor 1, and when we promote cpufreq, it add 1, so
 if it is 0, mean we didn't change the cpufreq */
 static int cpufreq_change_count;
 
+extern int thermal_hot;
 int anatop_thermal_get_cpufreq_cur(void)
 {
 	int ret = -EINVAL;
@@ -235,6 +236,7 @@ imx_processor_set_cur_state(struct thermal_cooling_device *cdev,
 	secondary CPUs that detached by thermal driver */
 	if (cooling_cpuhotplug) {
 		if (!state) {
+			thermal_hot = 0;
 			for (i = 1; i < 4; i++) {
 				if (cpu_mask && (0x1 << i)) {
 					anatop_thermal_cpu_hotplug(true);
@@ -245,6 +247,7 @@ imx_processor_set_cur_state(struct thermal_cooling_device *cdev,
 		}
 	} else {
 		if (!state) {
+			thermal_hot = 0;
 			if (cpufreq_change_count < 0)
 				anatop_thermal_cpufreq_up();
 			else if (cpufreq_change_count > 0)