thermal: constify of_device_id array

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick <[e-mail]>
Signed-off-by: Eduardo Valentin <[e-mail]>

drivers/thermal/st/st_thermal_memmap.c

···
 	.crit_temp		= 120,
 };
 
-static struct of_device_id st_mmap_thermal_of_match[] = {
+static const struct of_device_id st_mmap_thermal_of_match[] = {
 	{ .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata },
 	{ .compatible = "st,stih407-thermal",     .data = &st_407_cdata },
 	{ /* sentinel */ }

drivers/thermal/st/st_thermal_syscfg.c

···
 	.crit_temp		= 120,
 };
 
-static struct of_device_id st_syscfg_thermal_of_match[] = {
+static const struct of_device_id st_syscfg_thermal_of_match[] = {
 	{ .compatible = "st,stih415-sas-thermal", .data = &st_415sas_cdata },
 	{ .compatible = "st,stih415-mpe-thermal", .data = &st_415mpe_cdata },
 	{ .compatible = "st,stih416-sas-thermal", .data = &st_416sas_cdata },