thermal: Default OF created trip points to writable

When registering a thermal zone from device tree, default the trip
points to writable. By default, only the root user can change these.

This allows the trip points to be tweaked after the system has
booted.

Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: NPunit Agrawal <punit.agrawal@arm.com>
Signed-off-by: NEduardo Valentin <edubezval@gmail.com>

drivers/thermal/of-thermal.c

@@ -866,6 +866,7 @@ int __init of_parse_thermal_zones(void)
 	for_each_child_of_node(np, child) {
 		struct thermal_zone_device *zone;
 		struct thermal_zone_params *tzp;
+		int i, mask = 0;
 		u32 prop;
 
 		/* Check whether child is enabled or not */
@@ -896,8 +897,11 @@ int __init of_parse_thermal_zones(void)
 		if (!of_property_read_u32(child, "sustainable-power", &prop))
 			tzp->sustainable_power = prop;
 
+		for (i = 0; i < tz->ntrips; i++)
+			mask |= 1 << i;
+
 		zone = thermal_zone_device_register(child->name, tz->ntrips,
-						    0, tz,
+						    mask, tz,
 						    ops, tzp,
 						    tz->passive_delay,
 						    tz->polling_delay);